I guess this is more about being funny than actually useful to most of you guys. Nokia just released an interesting app for Lumia 920T users on China Mobile. The app only does one thing: to lock the phone to either 3G or 2G network.
This may raise some eyebrows, since normally one could select what kind of network he wants in the system settings of Windows Phone 7 and 8. But no, that doesn't apply to China Mobile's Lumia 920T, which stays on 3G network by default. The 2G/3G/4G switch was removed by request of the carrier, probably in order to keep as many users on its 3G network as possible.