Do you want to Jailbreak iPhone 3G to use it with any GSM network Sim card?
If it yes,I would recommend not to use the Jailbreaking method.For safe and secure use Remote Unlocking Service.You can get this service at reasonable cost from OnlineGSMUnlock.com  with easy step by step unlocking service.This is the fast and permanent unlocking service.

If you need to Jailbreak it follow the easy step by step unlocking instructions given from Idownloadblog.com .

Do you want to Jailbreak iPhone 3GS to use it with any GSM network Sim card?
If it yes,I would recommend not to use the Jailbreaking method.For safe and secure use Remote Unlocking Service.You can get this service at reasonable cost from ClassicUnlocking.com with easy step by step unlocking service.This is the fast and permanent unlocking service.

If you need to Jailbreak it follow the easy step by step unlocking instructions given from Idownloadblog.com .