Trade in my old phone to my husband for a new phone
Can my husband use my old iPhone 12 Pro Max as a trade in for him on the new iPhone 15 pro max
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That shouldn't be an issue as long as the phone is in good condition and you prepare it properly for a trade in. This link explains how to prepare an iPhone for trade or to be sold or given to someone --> What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support