Before i updated the august security patch my phone was unlocked and had a straighttalk att sim card. After the update now when i power on my phone it shows att logo, my service bars are different, and i can't cycle through 4g or 5g it's locked to one connection even with different apn settings. it installed att apps automatically also. i already cleared cache and factory reset with no luck. s20 ultra btw.
Solved! Go to Solution.
call at&t or your carrier, they should be able to help with this.
Opens in new window