AT&T Invalid SIM?


my at&t iphone 7plus starting giving me "invalid sim" message few nights ago. rebooting phone cleared problem bit keeps coming back. updated 11.2, , reset phone settings , network settings. fine hour or so, "invalid sim." ideas? haven't dropped phone recently. guess sim card going bad (?)
 

yea next course of action visit nearest att store , tell them you're getting invalid sim periodically on phone. guess sim card malfunctioning whatever reason.
 


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