How to delete data from android phone permanently before selling?

3 answer(s)
Answer # 1 #

Go to Settings → System → Reset → Erase all data (Factory Reset).

[5 Month]
Answer # 2 #

Remove SD cards and SIM cards before selling.

[4 Month]
Answer # 3 #

Encrypt your phone first before factory reset for additional security: Settings → Security → Encrypt Phone.

[5 Month]