> That's interesting. Both Verizon and Sprint have disabled SMS
>> completely when I requested it. Why can't T-Mobile?
> Maybe it has to do with the way GSM works. You didn't mention AT&T
> Wireless or Cingular. SMS is part of the GSM spec. I don't know if
> that's the case with CDMA.
It is, but can be inhibited if need be. I have to say, SMS seems to be GSM's achilles' heel. A lot of signalling functions on GSM appear to be handled by thinly vieled SMS messages, stuff that would be handled on a more formal level in CDMA through the paging channel. I'm willing to bet that T-Mobile is unwilling to fully disable SMS on an account because in many markets, they still use it for voicemail and other notifications.
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