1. Gather the items you'll need to activate service:
   • Your phone's serial number (sometimes referred to as IMEI). To find your phone's serial number, dial *#06# and then send the call.
   • Prepaid SIM card (If you're using an iPhone, the SIM card is already in your phone.)
2. Click the link to set up and activate your T-Mobile phone now.
3. Contact us​ if you need assistance.

For our latest postpaid plans, read about Magenta. When you switch to a postpaid plan, you can:

• Choose from one of our latest phones or devices.
• Finance your new phone through our Equipment Installment Plan (EIP).
• Sign up for JUMP!™ which lets you upgrade your phone without any hassle, while also helping to protect your phone in the event of damage, mechanical or electrical breakdown, loss, or theft.
• Having a postpaid monthly account will be a different experience than prepaid. Here are some things to keep in mind:
  • Credit check: To get the ball rolling, a credit check is required. All customers who sign up for Magenta go through this process.
  • Deposit: You may need to make a deposit before your new monthly plan can be activated.
  • Phone number: You can transfer (port) your current mobile number to your new monthly plan account, or you can start fresh with a new number.

Keep your phone or upgrade

When switching to a monthly postpaid account, you have a couple of options regarding your phone:

• If you'd like to keep your current phone, contact T-Mobile Customer Service so a T-Mobile rep can help make the switch easier for you.
• If you want to upgrade to a new phone, visit a T-Mobile retail store where a T-Mobile rep can guide you through the switch in-person.