I have got this phone from someone whose upgraded, however its locked to 02 (tariff, not PAYG), i understood that 02 dont lock their phones, but this IS locked, it will not accept my Virgin PAYG...... i have Googled, but unlocking it using some of the methods seem a bit dodgy. can i not just get an 02 payg sim( their free anyway,) and use that (after crediting of course) Thanks