By supported, do you mean permitted by the PTCRB Certification Program for GSM and UMTS Devices, which is administered by CTIA?
Sorry for the late response. Yes, I know that several operators have SMSCs and other equipment that is designated strictly for M2M applications, separated from smartphone/general application use. This protects mission critical M2M applications from SMS surges such as American Idol or Dancing with the Stars voting. I'm sure there are other reasons too.
I found out more about this. There are hubs that are used to connect operators' SMS servers with each other. These hubs provide a free service between operators, assuming that it benefits all operators. However, these hubs ONLY allow SMS from people, NOT from machines (M2M). This is to avoid spamming, among other reasons.
Therefore, if your M2M application requires SMS internetworking, you'll have to integrate with an SMS aggregator and pay for the service.
I think generally its better not to have sms internetworking with most M2M solutions - that way you can ensure that your devices are protected from spam or malicious messages from the wider world. If you need to accomplish a transaction where a consumer needs to be alerted of something, say an alarm being activated, its better to route that request via your application environment, rather than directly from device to consumer.
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