Default Pda works, but phone doesn't

I have installed WM2005 1.70.96WWE. (

Since I wanted to compare how good each of the 3 versions are, I have installed the ROM 3 times. Now under my xda2's program, there are:
- 3 "phone" icons
- 3 "calander" icons

Moreover, maybe as a result of the 3 "phone" icons, I can't even connect to my service provider and can't use the xda2 as a cell phone.

Can anyone please help? Many thanks in advance.