Hi guys, I'll be traveling to the US in a few weeks and looking into cell phone options. I found that straight talk is the cheapest route to go for data and calling. I have an unlocked iPhone 5 (canadian GSM model, same as AT&T). When I go to the straight talk site to order a sim card, and enter GSM as my option. The page then presents a simcard that says "T-Mobile compatible Sim card"... Which I assume is full size and I need to cut down (no worries here). Is this the right sim card? Will I get 3G service (in New York)? Or would it just be best to wait until I'm in the US, find a walmart and get it in person?