and if that's possible, then how could I unlock it to work with another sim card???
Thank you!
P.d. Excuse my bad spelling, I'm not very used to write in english.
Oh, I forgot it, i don't have the original sim card.
To unlock your iPhone 3g from carrier lock, use Remote unlocking service . You can get it from any of the online vendors like TheUnlockSpot.com to unlock it .