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One approach should be finding out what carriers accept Email2SMS. That's a very (and cheap) approach. That's what RememberTheMilk does.

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Yeah but won't that only work for pushing out messages to phones? What if you want two-way communication with your app?

try sending a text message to an email address. I think this works. Ill test it out.

Nm, cannot do it on iPhone. By that's because I can't type an @ in the recipient field.

Pretty sure I did it with my last phone.

email to phonenumber@txt.att.net / messaging.sprintpcs.com / etc... once you receive the text, a reply will (should? works for most major carriers - att on my iphone tested) send the message back to the original email address.

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