Can you please clear up a little dispute between my husband and I? He is saying I can't use my free t-mobile sim in a Verizon or Sprint Ipad. He says they are not GSM. From what I've read here that's not the case, but he doesn't think so. So to make matters worse, we went to BB and the BB salesperson swore up and down that Ipads are locked and you can only use a Sprint ipad with a Sprint plan and a Verizon ipad with Verizon and an ATT plan with Att and so on. I tried telling him they were unlocked and he laughed said he'd worked there long enough and they are indeed locked. I am planning to get my ipad online in the next couple days and the only two this particular store has in stock is Sprint or ATT. So I will ask you guys just once (and ignore my husband and this idiot BB guy), if I get a Sprint device, I will be able to use my free Tmobile sim in it, correct?