Switching iPhones is the moment most people lose data - not because backups
are hard, but because nobody verifies them. Here is the order that actually works.
1. Make a complete backup first
An encrypted local backup is the only kind that also includes Health data,
the Keychain and saved Wi-Fi passwords. See the
iPhone backup feature overview and a
step-by-step backup guide.
2. Confirm the backup is real
A backup that silently failed is worse than none. Check the Last backup
timestamp and size before wiping anything, and know your
data-recovery options in advance.
3. If the phone is second-hand, verify the hardware
Confirm the serial, parts and Activation Lock status before paying. Use a
used-iPhone inspection guide, and check
battery health separately - Settings rounds it.
4. Choose how you'll restore
iTunes/Finder is all-or-nothing; a desktop manager allows selective export. See the
iTunes comparison and the
3uTools comparison.
5. After the move: fix the usual snags
If the new phone won't connect, identify the exact
iOS error code and follow a
connection-fix guide rather than guessing.
6. Small things people forget
Re-create custom ringtones and set up
screen mirroring once you're settled in.
TL;DR
Encrypted backup -> verify -> check hardware (if used) -> selective restore ->
fix errors by code. Do it in that order and a phone swap becomes boring.

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