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Tipton, KS | It is said that T-Mobile sends out Preferred Roaming List, but if this phone is powered down, and then turned back on, this may update the Preferred Roaming List.
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However, you can also update T Mobile PRL manually through your cell phone. For Android devices, go to the main menu and select "Settings," followed by "System Settings" or "System Update" and then "Update PRL." It takes less than a minute for your phone to update automatically. For iPhones, tap "Phone" and dial the T Mobile PRL update code, ##873283# (i.e. "##UPDATE#"), then press "Call" and tap "OK" to complete the process.
https://itstillworks.com/things-boost-cell-phone-reception-13311.htm...
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TMobile woes
