Samsung SPH-i770 hard reset
USE THIS METHOD to hard reset your Samsung SPH-i770 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 on your PC before full reset!
If you know the hard reset using buttons / keys, pls leave a comment. All comments are welcome! :)