I've been told to do this twice now, and it did absolutely nothing twice now, except cause me to lose years' worth of Wi-Fi passwords.
Low-strength LTE speeds on my XS remain abysmal on 12.1 even after this step. What's worse, the phone is now reverting again to 4G.
Said it in #3271
12.1 iOS beta 5, 1.01.30 Modem Firmware, T-Mobile 34.0 carrier - Still Not Fixed, Weak signal drops to 4g, seconds of silence, System Failures, Will not recover LTE unless toggle Airplane mode., Will not seek & Hold LTE unless rebooted.
Yes WIFI 2.4 5GHz Preference and toggling 'appear' fixed different flavors of WIFI calling may still have issues
LTE speed tests show improvement but thats a fake carrier patch similar to more bars in more places.
Now
12.1.1 with 1.02.09 Modem Firmware, T-Mobile Carrier 34.5.3 better..... but still testing.
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my contact is saying that there is nothing in this update that improves cellular connectivity and that they are still looking into it.
12.1 GM That is correct