Moving from iOS 17.3 to Dev 18b2 with a SIM that currently has a SIM PIN causes an iPhone 15 Pro Max to not be able to get any cell network access, nor an option to disable or enter the PIN. All you can see is the Mobile Service section asking you to arrange cell service. Luckily I have a cellular iPad that I could remove the PIN from, so that I could proceed, but this is quite the oversight!
iOS 18 Developer Beta 2 - SIM PIN Issue
Have you raised a Feedback report? If not, please do so at https://www.apple.com/feedback/ then post the FB number here.
I’ve sent the feedback, thanks darkpaw. Didn’t see a feedback number though.