Hi, I used to have CM7 in my Nexus S, and I had an app that automatically puts the ip-prefix for all my calls (I'm Brazillian, and I use TIM code 041 to make cheaper calls). This app doesnt work on my MIUI 1.5.6 based on android 2.3.4. The option to add a prefix of MIUI dont do it automatically (as I know, but I dont know much at all). Could someone help me? PS: Dark UI rocks!!!