activate iPhone 4 and 3GS?

[chris82]

What will happen to my 3GS after i activate my iPhone 4?

Will the 3GS not work anymore for calls?

I want to be able to use my 3GS and iPhone 4 not at the same time of course how do i go about doing this?

Can i just get a adapter so the new micro sim will fit the 3GS?

[ianbroste]

Your big sim will be dead and your new microsim will be active. Just get a micro sim adapter, or make your old sim into an adapter by cutting out the shape of the micro-sim. Then you can use either your 3gs or your 4 depending on which one you have your sim in.