iOS 15.8 Update causes No Service

[MacTiki]

Updated an iPhone 6s Plus to iOS 15.8 and now the phone is constantly dropping service and displays NO SERVICE.

Areas the phone once operated with one or two bars now have NO SERVICE.

Reset network setting twice.
Powered off and on a dozen times.
Hard reboot a couple of time.

Still no luck.

The phone worked well before the update now it’s unreliable at best.

 

[DeltaMac]

Might be worth trying a full restore on your iPhone.

 

[MacTiki]

Might be worth trying a full restore on your iPhone.

Restore from backup???

 

[now i see it]

I just installed 15.8 on a 6S Plus and everything works perfectly

 

[MacTiki]

I just installed 15.8 on a 6S Plus and everything works perfectly

Good for you that you have not run into this issue.

What is the cell coverage like for the area you are using the phone? How many bars?

Prior to the update what iOS version were you running?

What carrier do you use?

What carrier update are you on?

Etc….

Any suggestions on how to fix this issue?

 

[JPack]

The modem firmware hasn't changed from 15.7.9.

 

[MacTiki]

The modem firmware hasn't changed from 15.7.9.

What does that mean? Please elaborate.