iOS 18 beta 5 also works for me!
BlackDenis777
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However, I found a solution that worked for me:
1. Update your iPhone to the iOS 18 developer beta.
2. Then update to iOS 18.1.
3. Use a computer to downgrade your iPhone to iOS 17.6.
This process successfully resolved the issues with the cellular network and call failures on my iPhone.
I hope this helps!
Same issue here, downgrade to 17.6 didn’t help!