Your contact list is hard to rebuild. Two minutes of setup protects it.
Option 1: sync with your account
- Open Settings → Accounts and make sure your Google (or manufacturer) account is added.
- Open the account and turn on Contacts sync.
- In the Contacts app, check that new contacts are saved to that account, not only to the phone.
On a new phone, sign in with the same account and contacts return after sync.
Option 2: export a VCF file
- Open Contacts → Settings → Export (names differ slightly by phone).
- Choose the contacts and save the .vcf file.
- Copy it to a computer or cloud storage.
To restore, open Contacts → Settings → Import, select the file and choose which account to save to.
Clean up duplicates
Use Fix and manage → Merge duplicates (or similar). Check the preview before merging.
Tips
- Keep one main account for contacts.
- Export a fresh VCF before changing phones or resetting.
- Check a few important numbers after restoring.
Related: choose your default phone app and recognising callers.
