Interestingly. I suspect rogers is using a different band than bell.
The difference between your AMSS (7500L and the galaxy 7500 one is the frequency bands supported. Try typing *#*#4636#*#* into the dialer and playing with the WCDMA, CDMA etc options. They may map to something different on your phone.
I suspect you may need to enable the debug interface and use qmat to switch the frequency support.
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