No Connection To Mobile Data

I installed the new developer beta 26 yesterday, but since that I only have problems with my iPhone. Besides not being able to update the software bc an error appears, I also don‘t have the abbility to use mobile data. If I try to, it only says „could not activate mobile data network“. I already tried to restart the phone, to reset it or to take the SIM out and in

No Connection To Mobile Data
 
 
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