Before you upgrade and trade-in your phone, make sure you do the following:
Backup your data - we explained how to backup your phone’s content above (“how to keep all of your data when you upgrade”). Remove SIM and SD cards - these cards can store personal information. Keep them in a safe place at home. Erase personal data - once everything is backed up, you can factory reset your phone in settings. This will remove all of your data. Disconnect your phone from accounts - you can remove your old phone from any accounts or paid subscriptions you have.