no you should return the phone to the person that lost it
yes
yes
i880 is from nextel and if you put your sim card from nextel service in to a nextel blackberry it should work .
If your Blackberry 8830 is already unlocked, then you may be able to use a GSM SIM card on it.
Under the battery there is a slot
no i dont think you can put a sim card in it
If it's just a regular SD card, then it should work fine.
Yes as long as the phone is att and has a sim card slot
Yes
Where is says 'Where would you like to save this Item' Put sim
you can put it in your phone's micro sd card and connect it to the actual adapter and put it in your pc or laptop. go to 'computer' on your pc from the 'start' menu and wait until you can find the sd card there, click on it and you may find all your blackberry's info there.
I think you would have to do it all over again or put the SIM card back in the old phone and copy all text.