I have an AT&T LG G3 phone and am now using T-Mobile but all the AT&T preinstalled apps are trying to do stuff which does not work of course and I am wondering how can I install the T-Mobile apps and override the AT&T apps? - I'd go as far as to install a new ROM if I could find directions. Kinda pointless to BYOP if all you can do really is make calls and not take advantage of a carriers special data software packages because of all this preinstalled junks inability to be removed. ugh!
If you can disable the AT&T apps, a few of the T-Mobile apps are in the app store (like My Account).
That's the only way.
You can't get WiFi Calling, in flight texting, and that with BYOP
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