Thread title says it all. Mostly. I'm currently with ATT and have an unlocked iPhone 5. I'm thinking of switching to TMo but want to check the coverage first hand before doing so. I got a TMo sim starter kit for free on their recent promotion. But when I pop it into the phone it says activation required. Is there any way to use it just to check signal strength, without activating it? If not, what's the cheapest, 1x way to activate it to check? TIA.