Phone with Girl Waving

T-Mobile accessibility

T-Mobile is committed to providing products and services that meet a variety of communication needs.

Accessibility support

T-Mobile will provide accessible support for wireless network service and billing inquiries. Please contact our Accessibility Customer Care at 1-833-428-1785 if you have any questions or need special assistance. For additional support, please contact Customer Care.

For media requests, commercial questions, or customer service inquiries, visit our visit our Contact Us page.

We’re proud to be one of the best places to work for employees with disabilities since 2018.

Diversity and inclusion make us who we are. That’s why we’re proud to be a top-scorer on the 2022 Disability Equality Index, making us one of the best places to work for employees with disabilities for the fifth year in a row. In addition, T-Mobile has been named Disability:In's Employer of the Year for 2022, solidifying our commitment to the accessibility community.

We’re offering devices with you in mind

T-Mobile offers accessible services and device options supported by the following operating systems.


Alternate billing options

T-Mobile's billing statements are provided online at and are accessible to the visually impaired using readily available reading programs. T-Mobile also offers alternate printed billing options. For more information please contact Accessibility Customer Care at 1-833-428-1785.

Directory Assistance Program

Our Directory Assistance Program helps provide greater access to 411 information services for customers with visual, physical and/or cognitive disabilities by offering credits for such services. For instructions on how to apply for the Directory Assistance Program, download the Directory Assistance Exemption Form: T-Mobile 411 Accessibility Form

For more information about the Directory Assistance Program or other accessibility benefits T-Mobile offers, our Customer Care department is available to assist you. Customer Care is available between 6:00 a.m. -11:00 p.m. CT, Monday through Friday, you can also email Toll free at 1-833-428-1785.



Real-Time Text (RTT) provides an alternate way of meeting the communication needs of consumers with disabilities. It provides a more instant transmission and delivery of a message as it is being composed, making it more equivalent to a typical voice conversation. For example, the user may be able to see partial responses and develop a response before the entire message is complete. This can help reduce crossed answers and better connect emergency 911 services in supporting locations.

For more information on the benefits of Real-Time Text and the adoption of RTT rules by the FCC, visit FCC RTT Rules Adoption.

Text–to-911 service

Users may be able to reach emergency services by sending an SMS text message to 911 from their mobile phones or devices, depending on where they reside. You will receive a bounce-back message if 911 text service is not available. When possible, the FCC encourages users to first contact 911 via voice call because text-to-911 is not available everywhere.

For more information on text-to-911 service by the FCC and what locations the service is available in, visit FCC Text to 911: What You Need To Know.


Easy-to-use handsets

T-Mobile offers a wide range of handsets to meet seniors' needs. From flip phones to affordable smartphones and premium phones, T-Mobile can help you find the right phone for you.

For more information check out T-Mobile phones.

Alternate billing options

T-Mobile's billing statements are provided online at and are accessible to the visually impaired using readily available reading programs. T-Mobile also offers alternate printed billing options. For more information, please contact Accessibility Customer Care at 1-833-428-1785.

T-Mobile Location Services

T-Mobile offers products that can help monitor your location and safety and keep tabs on your family. For more information about products that support location services, visit T-Mobile SyncUP DRIVE.

Virtual personal assistants

There are several virtual personal assistants available on today’s mobile devices that work hard to make life easier.


  • T-Mobile ensures that a certain portion of its essential handsets offered to customers are compatible with hearing aids.

    Some hearing aid users may detect interference in the form of a buzzing, humming, or whining noise when using a wireless phone. The amount of interference experienced may vary due to differences in immunity levels of hearing aids.

    Handsets are rated as hearing aid compatible under one of two standards created by the American National Standards Institute (ANSI):

    1. The 2011 ANSI Standard uses two ratings, M1 through M4 for microphone and T1 through T4 for telecoil. Under the 2011 ANSI Standard, a handset is rated as hearing aid compatible if it as rated M3 or M4 and T3 or T4. Phones that receive a rating of 3 or 4 usually cause the least amount of interference. Typically, the higher the M or T rating assigned to a phone, the less interference.
    2. The 2019 ANSI Standard, which must be used on handsets certified as hearing aid compatible after December 5, 2023, does not use the M and T rating system. Instead, devices are certified as hearing aid compatible or “HAC.” The 2019 ANSI Standard also requires testing of a device’s volume control capability.

    Although HAC certification is not a guarantee, it is a useful tool for consumers to determine the most appropriate wireless handset.

    For additional information about hearing aid compatibility with digital wireless phones, see the hearing aid compatibility brochure and the FCC guide.

    Important note about HAC phones

    Hearing aid compatible phones have been tested and rated for use with hearing aids for some of the wireless technologies they use. However, some newer wireless technologies used in these phones may not been tested yet for use with hearing aids. It is important to try the features of your phone thoroughly and in different locations, using your hearing aid or cochlear implant, to determine if you hear any interfering noise. Consult the manufacturer of your phone for information on hearing aid compatibility. If you have questions about return or exchange policies, consult your service provider or phone retailer.

    Handsets with Wi-Fi or Voice over LTE (VoLTE) calling capabilities may not have been tested for hearing aid compatibility in these calling modes.

  • What Type of Service Plan will I need?

    T-Mobile customers on voice plans will be able to take advantage of RTT on their RTT-enabled device. RTT is only available when a voice call is placed or received on an RTT-enabled device. If you have a data only plan and would like to use RTT, you will need to switch to a voice plan. A voice plan is required because RTT technology requires voice call functionality in order to work. To change your plan or obtain more information on which plans and devices are required for RTT, please contact T-Mobile's Accessibility Queue at 1-844-375-8107.

    Can I make an RTT call to someone who is not a T-Mobile subscriber?

    Maybe. Not all carriers have deployed RTT. In addition, RTT is not supported on older 2G and 3G networks.

    Can I use RTT if I am roaming on another network?

    Maybe. If you are roaming on a network that supports VoLTE and RTT, you should be able to make RTT calls while roaming. Not all wireless carriers have rolled out RTT yet, and not all LTE networks support VoLTE. If you are roaming on a network that does not support VoLTE or RTT calling, you will not be able to make RTT calls.

    Can I make RTT calls from my tablet?

    For a list of T-Mobile’s RTT device offering, including tablets, view the “RTT devices & availability” FAQ on this page.

  • Hearing Aid Compatible Phones

    T-Mobile currently offers the following hearing aid compatible handsets. Any handset rated M3 or better (as well as T3 or better) were evaluated using the 2011 ANSI Standard. Handsets rated as Pass were evaluated and meet the 2019 ANSI Standard.

    Best/Premium: Devices featuring higher-end design, materials, and finishes, paired-up with a more sophisticated user interfaces and functionalities.

    Device FCC ID  HAC Rating
    Apple iPhone SE (3rd gen) BCG-E4082A M3 & T4
    Apple iPhone 13 BCG-E3997A M3 & T4
    Apple iPhone 14 BCG-E8138A M3 & T4
    Apple iPhone 14 Plus BCG-E8139A M3 & T4
    Apple iPhone 15 BCG-E8427A M3 & T4
    Apple iPhone 15 Plus BCG-E8431A M3 & T4
    Apple iPhone 15 Pro BCG-E8435A M3 & T4
    Apple iPhone 15 Pro Max BCG-E8439A M3 & T4
    Google Pixel 8 A4RG9BQD M3 & T4
    Google Pixel 8a A4RGKV4X M3 & T4
    Google Pixel 8 Pro A4RG1MNW M3 & T4
    Motorola edge 2022 IHDT56AE7 M3 & T3
    Motorola razr+ 2023 IHDT56AJ3 M3 & T3
    Motorola razr 2023 IHDT56AL9 M3 & T3
    Motorola razr 2024 IHDT56AR7 Pass (2019 Standard)
    Motorola razr+ 2024 IHDT56AP9 Pass (2019 Standard)
    Samsung Galaxy S22 A3LSMS901U M3 & T3
    Samsung Galaxy S23 FE A3LSMS711U M3 & T3
    Samsung Galaxy S23 A3LSMS911U M3 & T3
    Samsung Galaxy S23+ A3LSMS916U M3 & T3
    Samsung Galaxy S23 Ultra A3LSMS918U M3 & T3
    Samsung Galaxy S24 A3LSMS921U M3 & T3
    Samsung Galaxy S24+ A3LSMS926U M3 & T3
    Samsung Galaxy S24 Ultra A3LSMS928U M3 & T3
    Samsung Galaxy Z Flip3 A3LSMF711U M3 & T3
    Samsung Galaxy Z Flip5 A3LSMF731U M3 & T3
    Samsung Galaxy Z Fold5 A3LSMF946U M3 & T3
    Samsung Galaxy Z Flip6 A3LSMF741U Pass (2019 Standard)
    Samsung Galaxy Z Fold6 A3LSMF956U Pass (2019 Standard)

    Good: Entry-level phones with straight-forward features, applications, and designs.

    Device FCC ID  HAC Rating
    Motorola edge - 2024 IHDT56AN6 Pass (2019 Standard)
    Motorola moto g power - 5G - 2024 IHDT56AN5 M3 & T3
    Motorola moto g 5G - 2024 IHDT56AQ3 M3 & T4
    Motorola moto g 5G - 2023 IHDT56AH4 M3 & T3
    Motorola moto g stylus 5G - 2023 IHDT56AL2 M3 & T3
    Nokia G310 5G 2AJOTTA-1573 M4 & T3
    OnePlus Nord N30 5G 2ABZ2-AA534 M3 & T3
    Samsung Galaxy A15 5G A3LSMA156U M3 & T3
    Samsung A35 A3LSMA356U Pass (2019 Standard)
    Samsung Galaxy A54 5G A3LSMA546U M3 & T3
    Sonim XP3plus WYPP14303 M4 & T4
    Sonim XP3plus Non-Camera Version WYPP14303 M4 & T4
    TCL 30 XE 5G 2ACCJH155 M3 & T3
    TCL FLIP Go 2ACCJN059 M4 & T4
    T-Mobile® REVVL® 6x 5G 2APXW-TMRV065G M3 & T3
    T-Mobile® REVVL® 6x PRO 5G 2APXW-TMAF035G M3 & T3
    T-Mobile® REVVL® 6 5G 2APXW-TMAF025G M3 & T3
    T-Mobile® REVVL® 6 PRO 5G 2APXW-TMAF035G M3 & T3
    T-Mobile® REVVL® 7 5G 2APXW TMRV075G Pass (2019 Standard)
    T-Mobile® REVVL® 7 PRO 5G 2APXW-TMRV07P5G Pass (2019 Standard)

    Last updated on 5/30/24

    For more information about phone accessibility features, as well as information about current and older phones, visit the Global Accessibility Reporting Initiative's website at

    For more information about hearing aid-compatible phones, please contact Customer Service.

    T-Mobile USA, Inc. has a limited phone exchange, return, and upgrade opportunity for hearing-aid-compatible phones that are used by customers meeting certain restrictions. Customers are limited to 14 days for purchases from a T-Mobile retail location and 20 days for purchases made online or over the phone. For additional information, please contact T-Mobile at 1-800-937-8997 or via TTY Customer Care at 1-877-296-1018 (TTY hours: 5:00 a.m. – 10:00 p.m. PT, daily).

  • Consumers can also use RTT to communicate with people using legacy teletypewriters, or TTY devices, on legacy networks. Note that RTT supports additional characters that may not be available on TTY. And because TTY is an older technology, TTY users have developed etiquette regarding how to signal when a message is complete, when to pause and wait for a reply, and when to end a call. RTT users may not be aware of this etiquette. If you are not sure how to use RTT when interacting with TTY users, or if you experience difficulty making an RTT call to a recipient using TTY, consider using an alternative communication method.

    How would a person become familiar with TTY etiquette?

    TTY etiquette describes a general communication style that is oftentimes applied by persons using TTY-oriented equipment. There are several online references currently available (e.g., etiquette guides and glossaries) that describe some of the shorthand references and techniques used by individuals to help more effectively “speak” during a TTY session.

  • Telecommunications Relay Services
    Telecommunications Relay Service (TRS or “relay service”) is a communication service that permits individuals with a hearing or speech disability to use the telephone system via a TTY, or other device, to call persons with or without such disabilities through a TRS relay center.
    Different forms of relay service include Text-to-Voice TTY, Voice Carry Over (VCO), Hearing Carry Over (HCO), Speech-to-Speech (STS), Spanish Text-to-Voice TTY, Captioned Telephone, IP Captioned Telephone, IP Relay, and Video Relay Service (VRS). More information about the available types of relay service can be found on the FCC’s TRS website.

    TRS is available in all 50 states and all U.S. territories for local and long-distance calls. TRS providers are compensated for the costs of providing TRS from either a state or a federal fund, and there is no charge to the TRS user other than standard calling rates.

    Relay service can be reached by dialing 711 or by contacting your state relay provider, as listed in the FCC’s TRS Directory. In the event of an emergency, TTY users should call 911 directly.

    T-Mobile TTY policy

    A TTY, also known as a Text Telephone Device or Telecommunication Device for the Deaf (TDD), is a special device that enables people who are deaf, hard of hearing, or speech-impaired to use the telephone to communicate. TTY works by allowing people to type messages back and forth to one another instead of talking and listening. The device is required at both ends of the conversation.

    The FCC requires digital wireless carriers to have the capability to transmit a call from a wireless phone that is connected to a TTY. While the FCC mandate pertains specifically to calls made to 911, the ability to make a call to 911 means users can also complete a call to anyone, anywhere, provided the party on the receiving end of the call also has a TTY.

    TTY on T-Mobile's network
    T-Mobile’s higher speed data services, including LTE, support use of IP-based TRS, including Video Relay Service, IP Relay, and IP Captioned Telephone Service through providers of those relay services. T-Mobile recommends use of these relay services as the most effective means of placing assisted calls, including to 911. If a T-Mobile customer nonetheless wants to use a mobile TTY, T-Mobile's GSM and UMTS cellular network is TTY compatible and may be used to reach 911. All T-Mobile price plans and most handset features will work with TTY. Customers will need to visit a T-Mobile retail store or contact Customer Service for assistance with selecting the proper rate plan and service activation.

    Customers should be aware that TTY does not work on voice calls that are placed over Wi-Fi or Voice over LTE (VoLTE) at this time. This means that TTY calls, including TTY calls to 911, cannot be made while using IP-based calling, including Wi-Fi Calling and Voice over LTE. Customers with communications disabilities who need to call 911 while using IP-based calling should use IP Relay, Video Relay, or IP Captioned Telephone Service to reach emergency personnel. Where available, customers may also send a text message to 911 directly (text-to-911).

    For more information, please view this short video about TTY on T-Mobile's network.

  • RTT calls to 911 may be answered by emergency services personnel using TTY devices. Consumers using RTT to contact 911 should be aware of the differences between RTT and TTY, including how certain characters are translated between the two and that emergency responders who answer the call are likely to use TTY etiquette in their responses. If you experience difficulty making an RTT 911 call, you may want to try an alternative means of reaching 911, including making a voice call.

  • Closed captioning contact information

    If you receive IP-delivered video from T-Mobile TV and have questions, concerns or a complaint, please contact us by writing to:

    T-Mobile Closed Captioning
    ATTN: T. Shwonek, Legal Affairs
    12920 S.E. 38th Street
    Bellevue, WA 98006

    Tel: 425-383-4000
    Fax: 425-383-4030

    For information on resolving disputes with T-Mobile, please review our Terms and Conditions under the heading “Dispute Resolution and Arbitration.” For additional information about closed captioning, see the FCC Guide.

  • T-Mobile customers with RTT-enabled devices will be able to send and receive RTT calls with other T-Mobile customers who have RTT-enabled devices. This functionality is available when the underlying network is 4G LTE (VoLTE) capable or Wi-Fi calling has been enabled. RTT will not function in the 2G/3G network. As inter-carrier RTT networks becomes operational, T-Mobile subscribers will also be able to send and receive RTT calls with subscribers of other carriers that support RTT functionality.

  • Real-time text (RTT) allows consumers to send and receive instant transmission of text messages as they are being composed, making these messages more equivalent to typical voice conversations. RTT also allows voice communication at the same time as text communication (simultaneous voice and text).

    T-Mobile customers using Voice over LTE (VoLTE) or Wi-Fi Calling on RTT-enabled devices are able to send and receive RTT calls with other T-Mobile customers who are also using VoLTE or Wi-Fi Calling using RTT-enabled devices, as well as to subscribers of other carriers that support RTT. A list of T-Mobile's RTT device offering can be found below.

    Samsung Galaxy Z Fold6
    Samsung Galaxy Z Flip6
    Motorola razr - 2024
    Motorola razr+ 2024
    Apple iPhone 15
    Apple iPhone 15 Plus
    Apple iPhone 15 Pro
    Apple iPhone 15 Pro Max
    Samsung Galaxy Z Fold 5
    Samsung Galaxy Z Flip 5
    Motorola edge - 2024
    Motorola moto g 5G - 2024
    Nokia G310 5G
    TCL Flip Go
    Apple iPhone 14
    Apple iPhone 14 Plus
    Google Pixel 8
    Google Pixel 8a
    Google Pixel 8 Pro
    Apple iPhone SE (3rd gen)
    Apple iPhone 13
    Motorola edge 2022
    Motorola edge 2024
    Motorola moto g stylus 5G - 2023
    Motorola razr+ 2023
    Samsung Galaxy A15 5G
    Samsung Galaxy A35 5G
    Samsung Galaxy S23
    Samsung Galaxy S23 FE
    Samsung Galaxy S24
    Samsung Galaxy S24+
    Samsung Galaxy S24 Ultra
    Sonim XP3plus
    Sonim XP3plus Non-Camera Version
    TCL 30 XE 5G
    T-Mobile® REVVL® 7 5G
    T-Mobile® REVVL® 7 PRO 5G

    The following devices are no longer sold, but are supported:

    Alcatel GO FLIP 3
    Apple iPad (5th Gen)
    Apple iPad (6th Gen)
    Apple iPad (7th Gen)
    Apple iPad Air
    Apple iPad Air (3rd Gen)
    Apple iPad Air 2
    Apple iPad mini (5th Gen)
    Apple iPad Mini 2
    Apple iPad Mini 3
    Apple iPad Mini 4
    Apple iPad Pro
    Apple iPad Pro 10.5-inch
    Apple iPad Pro 12.9-inch (2nd Gen)
    Apple iPad Pro 12.9-inch (3rd Gen)
    Apple iPad Pro 9.7-inch
    Apple iPhone 11
    Apple iPhone 11 Pro Max
    Apple iPhone 12
    Apple iPhone 12 mini
    Apple iPhone 12 Pro Max
    Apple iPhone 13 mini
    Apple iPhone 13 Pro
    Apple iPhone 13 Pro Max
    Apple iPhone 14 Pro
    Apple iPhone 14 Pro Max
    Apple iPhone 6
    Apple iPhone 6 Plus
    Apple iPhone 6S
    Apple iPhone 6S Plus
    Apple iPhone 7
    Apple iPhone 7 Plus
    Apple iPhone 8
    Apple iPhone 8 Plus
    Apple iPhone SE
    Apple iPhone X
    Apple iPhone XR
    Apple iPhone XS
    Apple iPhone XS Max
    Apple Watch Series 3 38mm
    Apple Watch Series 3 42mm
    Apple Watch Series 5 40mm
    Apple Watch Series 5 44mm
    Coolpad Snap
    Google Pixel 3
    Google Pixel 3 XL
    Google Pixel 3a
    Google Pixel 3a XL
    Google Pixel 4
    Google Pixel 4 XL
    Google Pixel 4a (5G)
    Google Pixel 6
    Google Pixel 6a
    Google Pixel 7
    Google Pixel 7a
    Google Pixel Fold
    LG Aristo 2 Plus
    LG Aristo 4+
    LG Aristo® 5
    LG G6
    LG G7 ThinQ™
    LG G8 ThinQ™
    LG K30
    LG K40
    LG K51™
    LG Q7+™
    LG Stylo 4
    LG Stylo™ 5
    LG Stylo™ 6
    LG V40 ThinQ™
    LG V60 ThinQ™ 5G
    LG WING™ 5G
    Moto g 5G 2023
    Motorola moto e
    Motorola moto e 6th Gen
    Motorola moto g 5G
    Motorola moto g play
    Motorola moto g stylus 5G (2022)
    Motorola moto g7 power
    Motorola one 5G ace
    Nokia G400 5G
    Nokia X100
    OnePlus 10T 5G
    OnePlus 6T
    OnePlus 7 Pro
    OnePlus 7T
    OnePlus 7T Pro 5G McLaren
    OnePlus 8T+ 5G
    OnePlus 9 5G
    OnePlus 9 Pro 5G
    OnePlus Nord N10 5G
    OnePlus Nord N100
    OnePlus Nord N20 5G
    OnePlus Nord N30 5G
    OnePlus Nord N300 5G
    Samsung Galaxy A03s
    Samsung Galaxy A10e
    Samsung Galaxy A11
    Samsung Galaxy A12
    Samsung Galaxy A13 5G
    Samsung Galaxy A14
    Samsung Galaxy A20
    Samsung Galaxy A21
    Samsung Galaxy A23 5G
    Samsung Galaxy A32 5G
    Samsung Galaxy A51 5G
    Samsung Galaxy A52 5G
    Samsung Galaxy A54
    Samsung Galaxy A6
    Samsung Galaxy A71 5G
    Samsung Galaxy J3 Star
    Samsung Galaxy J3 Star - Certified Pre-Owned
    Samsung Galaxy J7 Prime
    Samsung Galaxy J7 Star
    Samsung Galaxy Note 8
    Samsung Galaxy Note10
    Samsung Galaxy Note10+
    Samsung Galaxy Note10+ 5G
    Samsung Galaxy Note20 5G
    Samsung Galaxy Note20 Ultra 5G
    Samsung Galaxy Note9
    Samsung Galaxy S10
    Samsung Galaxy S10 5G
    Samsung Galaxy S10+
    Samsung Galaxy S10e
    Samsung Galaxy S20 5G
    Samsung Galaxy S20 Ultra 5G
    Samsung Galaxy S20+ 5G
    Samsung Galaxy S21 5G
    Samsung Galaxy S21 FE 5G
    Samsung Galaxy S21 Ultra 5G
    Samsung Galaxy S21+ 5G
    Samsung Galaxy S22
    Samsung Galaxy S22 + 5G
    Samsung Galaxy S22 Ultra
    Samsung Galaxy S22 Ultra 5G
    Samsung Galaxy S22+
    Samsung Galaxy S23 Ultra
    Samsung Galaxy S23+
    Samsung Galaxy S7
    Samsung Galaxy S7 Edge
    Samsung Galaxy S8
    Samsung Galaxy S8 Active
    Samsung Galaxy S8+
    Samsung Galaxy S9
    Samsung Galaxy S9+
    Samsung Galaxy Z Flip 3 5G
    Samsung Galaxy Z Flip 5G
    Samsung Galaxy Z Flip4
    Samsung Galaxy Z Fold2 5G
    Samsung Galaxy Z Fold3 5G
    Samsung Galaxy Z Fold4
    SCHOK Flip
    TCL Stylus 5G
    T-Mobile REVVL 2
    T-Mobile REVVL 2 Plus
    T-Mobile REVVLRY+™
    T-Mobile REVVLRY™
    T-Mobile® REVVL 4
    T-Mobile® REVVL 4+
    T-Mobile® REVVL 5G
    T-Mobile® REVVL V 5G
    T-Mobile® REVVL V+ 5G
    T-Mobile® REVVL® 6 5G
    T-Mobile® REVVL® 6 PRO 5G
    T-Mobile® REVVL® 6x 5G
    T-Mobile® REVVL® 6x PRO 5G
    Wiko Voix
    What is RTT?

    Real-time text, or RTT, is a communication protocol that allows users who are deaf, hearing impaired or have speech disabilities to send and receive textual messages in real time. Characters are sent as they are typed, allowing the other party to see a message as it is being written. Unlike other types of texting methods, RTT is similar to a voice call – when you place an RTT call, the other party must answer the call, and when the call is over, both parties hang up.

    Why is T-Mobile offering RTT?

    RTT is a replacement for an older technology that uses teletypewriter devices, or TTYs, to send and receive textual messages during a phone call. TTYs are mostly special telephones connected to old phone networks. RTT uses IP network technology that may provide improved reliability, accuracy, and speed. RTT also has increased functionality, such as an expanded character set, and offers the ability to use talk and text at the same time. Accordingly, RTT may provide a better way of communicating with text for consumers that need to communicate in real-time using text.

    How is RTT different from SMS or MMS?

    SMS (short message service) and MMS (multimedia message service) are “best effort” services, meaning that messages are not always received immediately, and sometimes messages are received out of order. RTT, on the other hand, is like a voice call – when you place an RTT call, the other party must answer the call, and when the call is over, both parties hang up. While RTT is designed to allow simultaneous voice and text, RTT calls to a TTY device may not have simultaneous voice calling available. In addition, group or conference calling is not currently available with RTT.

    Who can use RTT?

    T-Mobile customers, including customers who are deaf, hearing impaired or have speech disabilities, using VoLTE or Wi-Fi Calling and using an RTT-enabled device are able to send and receive RTT calls with other T-Mobile customers on VoLTE or Wi-Fi Calling who are using capable devices. In addition, T-Mobile customers are able to make RTT calls to and receive such calls from other carriers’ subscribers who are able to make and receive RTT calls. RTT technology is still relatively new, with some of the smaller carriers just beginning to deploy the service. Therefore, RTT calling may not work as expected if you are roaming on another carrier’s network or if you are roaming on a network that does not support VoLTE. RTT will not work on T-Mobile's 2G and 3G networks. Roaming customers who are able to make VoLTE calls may be able to make RTT calls, depending on the roaming network.