GSM network on rhodium 400

[htcuser12]

Hi all,
I have Sprint TP2, but I am now traveling overseas and want to use the phone in GSM mode (with Android of course). I am unable to get any signal on the phone. I tried two different network sim cards and they work perfectly well in WM.

I have set hw.force_cdma=0 in the startup.txt

Does any one know what the problem might be? or this phone cannot work in GSM mode in android?

At this time I am more concerned with basic cellphone functions rather than data, although data would also be nice.

Thanks