RESET
I am about reset my I phone 7 plus and give to my son so he can put his new information. Phone number will remain the same. Do I loose my phone No. after rest ?
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Here is how to reset. This will not change the phone number.
What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support
Of course, your son will need his own Apple ID.