Isn't Blackberry the only company providing guaranteed messaging with latency caps? (Verizon might, as well) This was an issue for the operations team at a pl

Isn't Blackberry the only company providing guaranteed messaging with latency caps? (Verizon might, as well) This was an issue for the operations team at a place where I worked. You couldn't use, say, T-Mobile because an SMS notification about a broken server might never arrive, or might arrive after an arbitrary delay.