Samsung Rex 70 S3802 hard reset
Use this method to hard reset your Samsung Rex 70 S3802 dual SIM phone: Enter *2767*3855#. Warning! All your data including contacts, messages etc. will be lost! Copy all your necessary data/Contacts/Messages etc. to SIM or make backup to your PC before full reset! Take out SIM card before full reset.
Your default security phone lock code preset 00000000 / eight zeros