Intriguing. Was fun reading all the dialogs. Not sure what your plans are, but it would be cool if there were hundreds of numbers, and talking to one would give you a clue to try another number, leading you on a trail, maybe a few trails, etc. You should also wire up the numpad to dial numbers (even though it is upside down)
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I did actually want to have conversations that gave you clues towards the correct number, but due to time (and difficulties with considering how characters would know information about the correct number), it didn't end up in the game. Not sure if I'll continue with the game's concept, but I agree that the trails of clues would definitely be a good improvement to the concept.