Hi, I recently installed MIUI 3.9.27 on my Lenovo S820, both sims can get signal but I cannot receive any mobile data. Wifi works fine though! When I click on the sim toolkit app it opens a window displaying the two sim cards. Yet when I click on either of them it says the application is not installed on the phone. When I go to Access Point Names and click on either sim the settings apk force closes and I've tried a multitude of things such as updating the radio to try and fix this. However, all have failed so far. If anyone could help me it would be greatly appreciated! Update: I managed to get the data working by using an apn app and getting to the apn settings through the back door. So it's definitely an apn settings bug!