Transferring everything.
WHAT TO DO BEFORE STARTING
Back up the old device Note which applications you actually use Ensure you have your recovery codes
WHAT TRANSFERS AUTOMATICALLY
Most data, through the system's transfer facility.
WHAT DOES NOT, RELIABLY
Authentication applications Some application data Messages, between different systems Licensed software activations
WHAT TO HANDLE DELIBERATELY
Your authentication application.
HOW
Use its transfer facility before wiping the old phone, or reset two-factor on each account using recovery codes.
WHY THAT MATTERS SO MUCH
Without it, you cannot sign into the accounts protected by it.
WHAT TO DO AFTER TRANSFERRING
Verify you can sign into important accounts Verify photographs and contacts arrived Verify messages arrived
WHAT TO KEEP
The old phone, until everything is confirmed.
WHAT TO DO BEFORE DISPOSING OF IT
Sign out of every account Remove the device from your accounts Reset it fully
WHY THAT ORDER
Resetting before removing the account association can leave it locked.
