Cell companys do not want resends of data. The use of TCP allows validated data for each packet. UDP is also different from TCP in that it doesn't provide any sort of guarantee that the receiver will receive packets in the right order; in fact, there's no guarantee that the packets will arrive at all. All that is guaranteed is that the packet's contents, if they arrive, will arrive exactly as sent, without data corruption.
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9810 BES Z10 on BES 9700 BIS