Originally Posted by Cavi Mike
What do you mean by "work properly?" I'm using a Verizon 9630 right now on T-Mobile and it's working just fine - though I'm not in India or Nigeria.
Posted via BlackBerryForums.com Mobile
Most GSM carriers do not have the service books for CDMA devices and ones that did are getting rid of them. Your 9630 will cease to work on T-Mobile eventually as well.
An example closer to home is some people are trying to get 9850 Torches to work on T-Mobile. The network doesn't have the service books and the "sideloaded" ones that worked on old Storms and Tours no longer work.