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by keith_erskine 6827 days ago
Free yes, but as someone else mentioned, you don't have any guarantee of service quality. We used email-to-sms when prototyping Padpaw and got mixed results on message delivery. This is an important requirement as we're sending out change of event (i.e. "game rained out") messages. Also, using SMS for signup is a lot more straightforward for people - they can send it right from the phone.