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You need a working mobile phone with service, but it doesn't need to be a smartphone.

https://lockitron.com/help/mobile#smsaccess

EDIT: Included more detail about needing a working mobile phone with service, due to ahlatimer.

So, you just need to write down the PIN somewhere you have service, right? Or am I misunderstanding when the PIN gets sent?

His question was does it work without having service. In other words offline mode. I think the answer is that no it does not.

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).

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