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Originally Posted by Przemolog
Yes, in GSM world usually the following is true: roaming agreement <=> SMS interchange. For GSM <-> CDMA SMS interchange, I suppose that extra agreements are needed (and possible extra software for setting some kind of GSM/CDMA gateway).
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The US operators subscribe to a service like Mobile365.com which translates messages from one type carrier to another. Anything T-Mobile does not recognize as GSM they send to the clearing house. This is why, if I send a SMS to a random number, (e.g. POTS, non-existant number) it reports that the message was delivered and bills me for the experience.