Those specs are indeed very Telstra-looking. But I doubt SE of all companies would release a phone JUST for Telstra. Given Ericsson's portfolio of just two HSDPA chipsets, the U350 (HSDPA 2100) and U360 (HSDPA 850/1900/2100), I don't find it likely that a SE-released HSDPA 850 phone would lack HSDPA 1900.
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Those specs are indeed very Telstra-looking. But I doubt SE of all companies would release a phone JUST for Telstra. Given Ericsson's portfolio of just two HSDPA chipsets, the U350 (HSDPA 2100) and U360 (HSDPA 850/1900/2100), I don't find it likely that a SE-released HSDPA 850 phone would lack HSDPA 1900.