It's all about agreements with app authors and more so if you bought any apps from any store, I expect trouble with that.
Beyond that you get into the same discussion as you see at link.
For many owners, it's a lesson in cellular they never expected to learn.
I have a Galaxy S2 with T-Mobile, but we will be moving to A Costa Rica soon. I found that I can unlock it and purchase a sim card to work with it there, but am not sure what features will still work. I am most concerned about when we come back to the US. Can we purchase a prepaid sim card to work with it. It makes no sense to sign up with monthly plans when we will not be using it for more than a month.I'd like to keep just one mobile phone.