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Data settings for non-AT&T Windows device

Learn how to program your Windows device with the correct AT&T APN and MMS data connection settings to use 4G (HSPA+)/4G LTE data services.


Verify SIM & data plan compatibility

To use AT&T 4G (HSPA+) or 4G LTE data services, you may need to program your data settings for a compatible, non-AT&T device, like an unlocked device from another carrier or a device purchased directly from the manufacturer.

Verify the device has a compatible SIM card and data plan before changing the data settings. This may resolve data connection issues without requiring any changes to your data settings:
  1. To verify SIM card compatibility:
    • You should already have the correct type SIM card if you recently purchased it new from AT&T or an authorized retailer. 
    • If you are using a SIM card from some other source or if you moved an active SIM card to a new device, verify SIM compatibility with 4G (HSPA+)/4G LTE data.
  2. To verify data plan compatibility:
    • If you moved an active SIM card to a new device and did not notify us of that change, your existing data plan might not be compatible. 
    • To update the device information on the account and make any required rate plan changes, the account holder or authorized user can contact us.
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Program data settings for non-AT&T Windows device

Windows Phone automatically programs the correct data settings during initial setup. However, you will need a compatible SIM card and data plan. If you are still unable to access data services, refer to Windows Phone Support for steps to program your device using the settings below.

Cellular Data/Internet Access MMS 
Username Not set Username Not set 
Password Not set Password Not set 
Proxy Server Not set WAP Gateway 
Proxy Port Not set WAP Gateway Port 80 
APN type IPv4v6 MMSC 
    Max Message Size 600k 
IP type IPv4v6 
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Program AT&T device data settings

If you are using an AT&T device, it should already have the correct settings. If you're having trouble accessing data services, visit Troubleshoot & Resolve to fix internet issues with your AT&T device.
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