Android 10 they moved apn xml to /system/product/etc make copy of xml make the changes user_visible="true" and user_editable="true" and its fixed in Android 10 Android 9 first you make 2 copys of your apn in system etc one for you to edit, one for...
I think we have root on LG g7 tmobile I need to test first I've seen it done trust me it worked
im putting TMobile modem.img for fastboot the one in op fastboot flash modem _____.img drag file( _____here) heres mega link for modem T-Mobile modem.img
i think i found issue with 5g nr is turned off i used settings database editor to change from 0 to 1
thank you i sent money because it was worth it