Is it possible to use an unlocked Captivate on T-Mob with prepaid sim?

[SquareBare]

Ive heard some people say that it is not possible for an unlocked AT&T captivate to work on t-mobile because of the differences in UMTS bands.

Vibrant:

GSM
850/900/1800/1900

UMTS
2100/1700

Captivate:

GSM
850/900/1800/1900

UMTS
2100/1900/850

My question to the experts though, is if I want to use nothing but voice and SMS / MMS on a prepaid sim with T-Mobile. Can I do this with the captivate?

Seriously, the 3g means nothing to me and I have no desire to pay for it, would just like to use voice and SMS / MMS.

Will this phone be able to do that at all?

 

[Croak]

If you can get it unlocked, it should work on GSM voice just fine.

But, so far, nobody has been able to unlock it, and AT&T refuses to do until at least May 2011 (and doesn't even have the codes yet, according to some reports).

 

[SquareBare]

If you can get it unlocked, it should work on GSM voice just fine.

But, so far, nobody has been able to unlock it, and AT&T refuses to do until at least May 2011 (and doesn't even have the codes yet, according to some reports).

Bah, damn AT&T. Why did samsung make theirs the best looking one! Oh well, I suppose I can just make do with a vibrant, the captivate is going to be a royal pain in the butt to work with with the no sideloading and what not.

(Maybe I can get a case to cover up its i-phone wannabee appearance).

Thanks a ton for your info!

 

[Croak]

No side-loading is a 30 second permanent fix after it's rooted, which is a 60 second fix counting reboot time.

It'll be unlocked before too much longer, I'm pretty sure of that.