I just did the following:
Before:
-Phone: Sprint Touch Pro 2 with T-Mobile SIM card inserted
-Rom:
[11-28-09] [ROM] MR.X WM6.5 V1.6.5 [Build 21864]
-Radio:
1.96.00WU (Sprint stock edited)
-SIM unlocked, Security Unlocked, Hard-SPL
After:
-Phone: Sprint Touch Pro 2 with T-Mobile SIM card inserted
-Rom:
Telus_Rhodium_W_Stock_1.19.661.3.exe
-Radio:
1.96.00WU (Sprint stock edited)
-SIM unlocked, Security Unlocked, Hard-SPL
Results:
-I did a clear storage immediately after flashing to the Telus ROM.
-I did not reflash the radio yet.
-So far I am getting the same exact results as before. After setting the phone to GSM only, the phone did not pick up a signal while "GSM Network Selection" was set to "Automatic." After setting it to "Manual" I was able to register it onto the T-Mobile network and get a signal. Since this is a WM6.1 ROM, there is no "Band" setting in the "GSM/UMTS Services" tab, so I don't know if that could be an issue.
-As for data, it's also still not working. I deleted the default Telus connection and created a GPRS/3G connection to epc.tmobile.com, did a soft reset, but the connection did not work.
I'll try reflashing the radio and keep you posted. I'm currently at work, so it might be a while. Thanks again, Olipro.