I thought I answered that, while also providing additional information. I apologize if that seemed rude in any way.

You did not. The OP was asking if you had a phone in the equivalent of "airplane mode" or just no service where you are, would Lockitron work? You have a mobile phone, which meets your criteria, but Lockitron would not work with SMS access, since you can't send an SMS. Would it work for smart phones? I have no idea. The page you linked to didn't say one way or the other (or if it did, I didn't see it).