iPhone
- Back up to iCloud or your computer.
- Settings → [your name] → Sign Out: enter your Apple ID password, Find My turns off.
- Using an eSIM? Transfer it to your new phone first, or erase it with the phone when the iPhone asks.
- Settings → General → Transfer or Reset iPhone → Erase All Content and Settings.
- Take out the SIM card if there is one.
The detailed walkthrough, with the special cases: erase your iPhone before selling.
Samsung Galaxy
- Back up with Samsung Cloud, Google or Smart Switch.
- Settings → Accounts and backup → Manage accounts: remove your Google account, then your Samsung account.
- Settings → General management → Reset → Factory data reset.
- Take out the SIM card and the microSD card.
Google Pixel and other Android phones
- Back up with Google One or to your computer.
- Settings → Passwords, passkeys & accounts (Passwords & accounts on older versions): remove your Google account.
- Settings → System → Reset options → Erase all data (factory reset).
- Take out the SIM card, and the memory card if there is one.
Check that it worked
- The phone restarts on the welcome screen, like a new phone.
- It no longer appears in your devices on iCloud.com or in your Google account.
And then, at SubSell
Every phone we buy goes through professional data-erasure software before any resale, even if it has already been reset, and an unsellable device is recycled with its storage destroyed. How we erase your data.