You'd need to try a small independent mobile retailer or look for a suitable unlocking website on-line. Perhaps try; The PhoneUnlockers; http://www.thephoneunlockers.com/155.html
Hi is your iphone 4 locked to network .Then visit Unlock-Zone.com here they unlock iphone from network lock using remote unlocking service .Before getting the service check whether the service is available for your country and network provider to which your iphone is locked at present .If available then pay for it and unlock your iphone4.After unlocking your iphone you can freely use any GSM sim in it.
Ideas
You'd need to try a small independent mobile retailer or look for a suitable unlocking website on-line. Perhaps try; The PhoneUnlockers; http://www.thephoneunlockers.com/155.html
Hi is your iphone 4 locked to network .Then visit Unlock-Zone.com here they unlock iphone from network lock using remote unlocking service .Before getting the service check whether the service is available for your country and network provider to which your iphone is locked at present .If available then pay for it and unlock your iphone4.After unlocking your iphone you can freely use any GSM sim in it.