Mobile Data Not Working After Dec. 30. 2020 Update

[user6q8gMz56bL]

I updated my S9 on Dec. 31, 2020 and now the mobile data is not working. Phone calls have also been on and off. I am on the AT&T 3G (Cingular APN) since my plan is grandfathered and is not compatible with 4G/5G data plans. AT&T believes my issue is due to the Samsung update.

[user6q8gMz56bL]

Also wanted to add that AT&T replaced my sim card which did not fix the problem. Mobile data is still showing as "Disconnected".

[rayjohnson12483]

I'm having the same issues something to do with the APN im using a galaxys10 note plus

[Pam__R]

I'm having the same issue and I'm getting irritated because it worked fine before the update.

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@user6q8gMz56bL wrote:

I updated my S9 on Dec. 31, 2020 and now the mobile data is not working. Phone calls have also been on and off. I am on the AT&T 3G (Cingular APN) since my plan is grandfathered and is not compatible with 4G/5G data plans. AT&T believes my issue is due to the Samsung update.

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[BMWR606]

similar with my unlocked S9 on sprint.
did the update on 12/31 and since only have 4G LTE. 4G LTE+ is gone.
download speeds went from 100 Mbps - 140 Mbps to 3Mbps - 4Mbps.