DEEPRISER: Go To Menu>Settings>Connectivity>Data Communication>SMS Access> And See If Circuit switched Is Selected. If Its Not, Selecting Will Solve Your Problem. If It Is Selected, Then You Need To Check The Gateway Number In SMS Settings.
RAZTAZ: Flashing Will The New Firmware Will Debrand Your Phone. In Order To Unlock, You Need To Use A Patch. Use Simox Sim-Lock Patch Generator. Visit The Link For Tool And Instructions: Remove SIM-lock patch generator - Top Sony Forums
ahlock: I Dont Get What Is "HP". However Talking In General Flashing With Normal (Non-Branded) Firmware Debrands The Phone But Doesnt Unlocks It. To Unlock You Need To Patch.