I suspect that rogers in that area had 1900 towers (which the 7500 AMSS supports), but bell had 850 towers (which the 7500 AMSS doesnt support).
Although both networks use 850/1900, it would depend on your location which frequency was in use.
qmat has a provisioning tool that lets u select the bands. Its a qualcomm tool which u'll need to find _somewhere_ :P
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