You'll need one for each phone. They are $1.99 each. Any GSM SIM can activate it once it's unlocked.yes and yes.
Do you have SIM cards in these phones?i did go to ebay and purchased the service " thro a different name tho " and they sent me the same steps and said that both 3gs phones that i am trying to unlock are ready
so i went to iTunes coneected the phone , restored and upgraded to 6.1
both phones now are stuck at activation screen and didn't get the phones are unlocked pop up ....
Okay, so it worked on two of the four. I'm guessing that the two (3GS') that it didn't work on have the iPad baseband. Were these phones unlocked in the past by installing the 6.15.00 baseband and then ultrasn0w? If so, you need to downgrade the baseband before the factory unlock can go through.the main problem is i used this method with 4 phones 1 iPhone 5 1 iPhone4s and 2 iPhone3gs
the 5 and 4s did unlock and working fine , the 3gs both got stock on activation screen ....
http://www.redmondpie.com/how-to-downgrade-iphone-3gs-3g-06.15.00-to-05.13.04-baseband-for-unlock-and-working-gps/you are correct , both iPhone 3gs has ipad firmware, how do i restore it ? any idea ?