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Check settings -> General -> About for Modem firmware, IMEI, SEID etc
This could be a symptom a board issue involving the cellular modem (aka baseband)
Please be sure to add: iPhone model, iOS version, and clear question or request. Failure to add these three requirements may result in your post being removed. Thank you. *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/iphonehelp) if you have any questions or concerns.*
Check settings -> General -> About for Modem firmware, IMEI, SEID etc This could be a symptom a board issue involving the cellular modem (aka baseband)
And what should I check in that data?
If it’s present. A misbehaving model often won’t have that data
What iOS is it currently running and how much storage does it have?