amod32 Said:
"After upgrade to15 version my sim is not showing up: Thank you! Yes I see No service available. however after following the instructions from the link you provided .. there is no such cellular update .this issue started coming just after the ios upgrade."
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Troubleshooting "No Service":
A. Whom to Contact:
Take this to the Carrier, as they are the one who provide you with the service of configuring your SIM card.
B. "No SIM":
"No SIM"*** is shown on the top-left corner of your screen. So, go here to fix that: If you See 'invalid SIM' or 'no SIM' on your iPhone or iPad - Apple Support
C. Report this to Apple:
Do your part: Let Apple know what is going on here. Provide them with feedback on this. They may not get back to you directly, but the more feedback they received on this, the more they will know what is going on, and what needs to be fixed in updates to come.
- Go Here: Feedback - iPhone - Apple
- Comment: that it is after installing the update when the issue began
- Select: "Bug Report" for the "Feedback Type"
- Proceed from there aw necessary