What is the proper procedure for such a move?
Should be easy-peasy. If your upgrade to the G5s+ is successful, it should have automatically canceled the G4+, therefore leaving the G4 without a number and deactivated.
Simply have her activate the new to her G4 and initiate a Number Transfer (or Porting)
This document (although you are not really selling it), covers the basic’s.
Does that help?
edit 2: just wondering if you are gifting to her or giving it to her, makes a difference.
I’d suggest you remove any screen lock, then factory reset the phone before giving it to a friend, to erase all your personal content.
Thank you all for the good info!
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