Model: Toshiba TS 803
1. Turn on your phone with a SIM Card not from the original network, IE It's not locked to
2. The phone will display a message somethign similar to: 'SIM Error. This SIM card cannot be used'
3. Press the centre menu key for about 3-4 seconds. The phone will then display 'Enter Code'
4. Enter the unlocking code provided
5. The phone will then reboot itself and once completed, the handset will be unlocked.