Ipad 6th generation cellular+wifi. At&T SIM not working anymore
I have had a pay as you go AT&T account for 10 years, presently I have a iPad 6th generation.
I buy the monthly cellular several times a year. Tried to activate it again for a month, and says, Invalid. In my iPad settings>cellular>manage AT&T account>Invalid Access. (USIM9991). How do I get an updated SIM card for iPad 6th generation. I really don't want to switch from AT&T.