HTC SPV C550 (Hurricane)

I am pretty sure I know the answer but wanted to confirm. This is a GSM 900 phone and Cingular uses GSM 850 thus this would NOT work on the cingular network, is that correct ? SO if one is looking for a windows mobile phone on cingular we ar basically limited to the SMT5600 (I am excluding Motorola phones as I have yet to see one work reliably, really not option for me).
thanks