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Beluga doesn't use SMS for the transport layer they use TCP. Groupflier (me) and Groupme use SMS and Twilio. Congrat's to the Beluga team!

GroupMe 2.0 (released today) uses either SMS or Push/TCP in the iPhone and Android apps.

Yes I saw that announcement. Our iPhone app also uses TCP, the goal is to to switch SMS traffic to TCP traffic over time.