In order to unlock the Sony Ericsson C902 phone, you first choose the make and model from their list along with the IMEI number and the network to which your Sony Ericsson phone is locked to. To find out the IMEI number, dial *#06# on your phone's keypad. They also allow for international unlocking where the unlocking is not limited to just United States.
You then choose the payment option. They price very aggressively and charge less for unlock services. They accept most credit card like most of the unlock services, but the best part I found was the ability to pay by PayPal. PayPal gives me a secure payment option , in this site http://www.theunlockarena.com/unlock-your-phone/rs13wp2/
i got the unlock code , using the unlock code specified in it i unlocked my mobile safely without vain , then without revealing my credit card number to someone else and also gives me the fraud protection. So, props to these guys for ability to take PayPal payment & gain solution as i got . .