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I've read the spec. In fact, i'll go further. I've built multiple election systems that use SMS to send data around :) Every carrier tech i've talked to tells

I've read the spec. In fact, i'll go further. I've built multiple election systems that use SMS to send data around :) Every carrier tech i've talked to tells me the same thing - the order of messages is not guaranteed nor is it recoverable. So while it's not that i don't believe you, it's that "in practice, it seems everyone thinks and does otherwise". "This is sufficient for correct reassembly." Except, as you prove later, it isn't when the unique ids can match other messages :)

Animats 11y ago
If you have your own system which doesn't send UDH headers, and you can't reassemble, it's your problem. SMS messages are not ordered, but then can contain ordering info. The major smartphones all send UDH headers, which have enough data for reassembly. At least if you don't keep old fragments for insanely long periods.