Sim failure right after 17.1.1 update

1. 

Remove and reinsert the SIM card.

If it doesn't help visit your carrier, maybe the SIM card is damaged, ask for a replaced (new) card. Normally it is free.

Ask also to check if the SIM tray is bent, as even a tiny misalignment can cause the SIM card to not fully connect with the internal contacts in your iPhone.

2.

See these Apple articles below:

If you see No Service, Searching, or SOS on your iPhone or iPad

If you see No Service, Searching, or SOS on your iPhone or iPad - Apple Support

Manually update your carrier settings on your iPhone or iPad

Manually update your carrier settings on your iPhone or iPad - Apple Support

Update your network provider settings manually on your iPhone or iPad

Update your network provider settings manually on your iPhone or iPad – Apple Support (UK)

If you see a Cellular, Ultra Wideband, or Apple Pay Issue message after an iOS update or restart

If you see a Cellular, Ultra Wideband, or Apple Pay Issue message after an iOS update or restart - Apple Support

after 17.1.2 my iPhone 15 could't detect the SIM although it was working fine with other mobiles. After trying all on/offs, restarts, network resets - I couldn't revive the SIM, and then had to switch over to e-sim (Airtel postpaid).

The process was easy and fast. within minutes the e-sim was activated and the physical sim deactivated. But if the carrier doesn't provide e-sim facility then the problem would have put me in trouble.