I unlocked my 9700( AT&T ) and want to user on t-mobile ( US )
Can someone tell me is there any setting or how can i use ?
even i cant register ( its brand new box pack device i got as gift )

Did you put your TMO SIM card in?

Is the device activated on TMO?

How did you unlock it?

I have software so i can unlock my device without any issue device up and running on Tmo so i am able to make phone calls w/o any issue .
When i try to register on tmo ther are no regitsrtion email coming back ...

Did you subscribe to a BlackBerry Data Plan through T-Mobile US?

not yet but atlest i get registertion email as soon as i insert the sim card right ?

im on TMO PrePaid Plan

No, you won't get a BlackBerry Registration message unless you have a BlackBerry Data Plan.

hmmm , ok if i enabled BIS / BES on tmo account its working w/o any issue mean there are any issue other then this ?

I don't understand what you are asking.

Sorry to make you confused , Mean this is AT&T Brand Unlocked 9700 BB
if i start using on TMO any issue to register on TMO network as far as Internet ( BIS /BES )

You won't get 3G speeds, but other than that, it should work fine.

Kool and Big Thanx

Oh... and you won't get UMA either.