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[](https://www.t-mobile.com) ### Manage Links Click any [available links](https://www.t-mobile.com) to add. Click any [added links](https://www.t-mobile.com) to remove. Links with [no highlight](https://www.t-mobile.com) can't be sent. Done (0 Links) Troubleshooting for the Inseego FX4100 cellular router. ## On this page: - [Device Placement](https://www.t-mobile.com#heading1) - [LED Alerts](https://www.t-mobile.com#heading2) - [Toggle Network Mode](https://www.t-mobile.com#heading3) - [Check Antenna Switch](https://www.t-mobile.com#heading5) - [Wi-Fi SSID](https://www.t-mobile.com#heading6) ## [](https://www.t-mobile.com)Device Placement - Ensure you have chosen a good location for your router: - Ideally on an exterior wall - Near a window but not in direct sunlight - On or above ground level (not in a basement) - Clear from obstructions and interference from other electronic devices - Outside of cabinets or locations that can get excessively hot - Try different locations to try to get a better signal.  - Move the router, then check the LED behavior: - The device LED is the middle LED with the bars. - It is blue for a great signal, green for a good signal, and yellow for a fair signal. - Use the Inseego app:   - Download the Inseego app from the App Store or Google Play. - Connect to the device's Wi-Fi and open the Inseego app. From the home page, select your device and select __Go to location survey.__ - Follow instructions in the app to find the best place for your device. - It may take the router 1-2 minutes to boot up after it’s moved.     ## [](https://www.t-mobile.com)LED Alerts The FX4100 has an LED display with alerts. - To view the alert, select the display button to toggle through the menu options. - The last option is Alerts. - Press the display button for 3 seconds to review. __LED Display Message__ __Troubleshooting__   __Show display with x through routing arrows__   Contact us for help. __Invalid SIM__ Contact us for help. __SIM Error__ 1. Power off the device. 2. Reinsert the SIM and try again. 3. If issue persists, c[ontact us for help.](https://www.t-mobile.com) __No SIM__ 1. Power off the device 2. Reinsert the SIM and try again. 3. If issue persists, contact us for help. __No Service__ [The device cannot detect the LTE/5G network.](https://www.t-mobile.com) 1. [Change Network Technology to __Auto__ to expand network search.](https://www.t-mobile.com) 2. [Refer to Toggle Network Settings below.](https://www.t-mobile.com) __No Mobile Network__ No mobile networks are detected. 1. Review device placement guidelines. 2. [Change Network Technology to __Auto__ to expand network search.](https://www.t-mobile.com) 3. [Refer to Toggle Network Settings below.](https://www.t-mobile.com) 4. [If issue persists, contact us for help.](https://www.t-mobile.com) __Updates Available__ - A firmware update is available. - You can install from the LCD screen or wait, and the update will be installed automatically or on the next device reboot. __Update Failed, No Changes__ - Reboot the device and the device will re-attempt the firmware update. - If this happens repeatedly, contact us for help[.](https://www.t-mobile.com) __90% Data; Fees Possible__ - This alert is set by the user and does not reflect T-Mobile Network data usage. - Change these alerts in the Web GUI under __Data Usage.__ - To view T-Mobile Network Usage, refer to the Account Hub. __Data Limit Hit, Fees Apply__ - This alert is set by the user and does not reflect T-Mobile Network data usage. - Change these alerts in the Web GUI under __Data Usage.__ - To view T-Mobile Network Usage, refer to the Account Hub. __Wi-Fi Is Off__ 1. Reboot the router. 2. If this doesn’t work, then turn Wi-Fi on by connecting to the router using an Ethernet cable. 3. If this doesn’t work, then factory reset the router. 4. If the issue persists, contact us for help. __Device Hot, Turning Off__ - The device will turn off. - Follow the device placement guidelines above. __No 5G SA, Check Mode__ 1. Change 5G Network Mode to Auto (NSA/SA) or NSA. 2. [Refer to Toggle Network Settings below.](https://www.t-mobile.com) __No 5G NSA, Check Mode__ 1. Change Network Technology to Auto (LTE/5G). 2. [Refer to Toggle Network Settings below.](https://www.t-mobile.com)     ## [](https://www.t-mobile.com)Toggle Network Mode Depending on your location, changing the Network Settings may help. - Option 1: If the router is online, change the setting using Inseego Connect. 1. Select the device from the list, then __Configure > Mobile Network > Carrier Settings__. 2. Ensure Network Technology is set to __Auto.__ 3. Change 5G Network Mode to __NSA__. 4. The device will reboot. 5. Use your phone to conduct a speed test. 6. If the device is not faster, change 5G Network Mode back to __Auto.__ - Option 2: Change settings using the Web GUI: 1. On your phone or laptop, verify you are connected to the Wi-Fi of the Inseego FX4100 router. 2. Navigate to http://192.168.1.1. 3. Go to __Settings > Advanced tab >__ select __continue.__ 4. On the __Cellular__ tab, ensure Network Technology is set to __Auto__. 5. Change the 5G Network Mode to __NSA__. 6. The device will reboot. 7. Use your phone to conduct a speed test. 8. If the device is not faster, set 5G Network Mode back to __Auto__.     ## [](https://www.t-mobile.com)Check Antenna Switch The FX4100 has a hardware switch. - On the back of the FX4100, there is a label __SIM / External Antenna.__ - Remove the back plastic cover on the router, and ensure the switch is set to __Ext Ant OFF.__   ## [](https://www.t-mobile.com)Wi-Fi SSID If you can’t see the Wi-Fi SSID, or you can see the Wi-Fi SSID but can’t connect. 1. Verify you can see the Wi-Fi SSID from other devices. 2. If you can't see the Wi-Fi SSID from any device: 1. Reboot the router. 2. If a reboot initially resolves the issue, but then it comes back, disable DFS (dynamic frequency selection) from the WebGUI ([http://192.168.1.1](http://192.168.1.1)) under __Wi-Fi Settings.__ 3. If available, connect to the router with an ethernet cable to validate Wi-Fi is turned on.  1. Navigate to [http://192.168.1.1](http://192.168.1.1) 2. Select __Wi-Fi.__ From the __Settings__ tab, ensure Wi-Fi is enabled. 3. From the __Primary Network__ and/or __Guest Network__ tab, ensure __Broadcast primary network name (SSID)__ is checked. 4. Factory reset the router by holding down the reset button on the back of the router for five seconds. 5. If the issue persists, contact us. 3. If you can see the SSID from other devices, but just can’t with one: 1. This is rare and can happen with older devices, especially printers. 2. Go to the Wi-Fi settings in Inseego Connect and under 802.11 mode, select 802.11bgn. 3. Try connecting with the device again. 4. If you can see the SSID but can’t connect: 1. If the device can see the Wi-Fi network but not connect, change the security type to WPA2 Personal or WPA/WPA2 mixed mode. 2. If you continue to have issues, contact us.     * * * Was this helpful? * * * ## Get answers from our T-Mobile Business Expert, 24/7. - [1-800-375-1126](tel:18003751126) - [@TMobileBusiness](https://twitter.com/TMobileBusiness) - [T-Mobile for Business](https://www.facebook.com/TMobileforBusiness)