3G i phone and tmobile?

Ya sure the iphone 3g will work freely with t-mobile sim only if the iphone is unlocked one else if the iphone is locked to some other network provider then it wont accept t-mobile sim until you unlock it ...You can easily unlock your iphone using sites like TheUnlockArena.com here they are rendering remote unlocking service to unlock all model iphone from network lock .You first check that whether the service is available for your country and network provider .If yes then pay for it and unlock your iphone 3g then freely use it with any GSM sim ...Sure the picture ,video and internet will work in your iphone with t-mobile sim in it ...