My S21 does that sometimes. I power it down for a restart. If that doesn't work, I power it down and remove the back cover, remove the sim card, carefully use an eraser to rub on the sim card contacts, reinsert it back into the phone, reassemble the cover and power it back on.
My S21 does that sometimes. I power it down for a restart. If that doesn't work, I power it down and remove the back cover, remove the sim card, carefully use an eraser to rub on the sim card contacts, reinsert it back into the phone, reassemble the cover and power it back on.
F Dryer さんによる