Ive been looking around and researching on how to get wifi calling on AOSP roms. I have made what I believe to be a big discovery. T-mobile now uses IMS for newer android phones, which is UMA/sip etc. I decompiled the ims-service.apk from the stock DLJA rom. I found an XML that contains the settings to use the service! You can get the IMS installer from here http://code.google.com/p/the-ims-ope...t-for-android/ I put the settings into the app and tried connecting but it came up with ER05, invalid SIM card. I googled that and it I get leads to saying that the sim isn't authenticated for WIFI calling. I know that it is, because it works fine on stock roms. I've also attached a logcat of me attempting to connect. I've attempted to change some of the info of the strings to reflect my personal phone number but that did not change anything.