Buying, selling & repair
Most lock problems are bought, not caused. Five minutes of checks before paying — and the right erase order before selling — prevent almost all of them.
Used iPhone buying checklist
Checks to run before paying.
Original, refurbished, or replacement?
Read the model number: M, F, N, P.
Erase before selling: the checklist
Sign out first, then erase — in that order.
Transfer to a new iPhone safely
Quick Start or backup restore, checked before erasing the old phone.
Parts pairing and repair, explained
Why a replaced part may warn you, and what genuine repair buys you.