I have an Unlocked T-Mobile M7 with a Cricket Wireless sim, I cant get the mobile data to work properly after updating to Lollipop with the RUU. It was fine before the update. I tried adding a new APN following crickets directions from here https://www.cricketwireless.com/support/apps-and-services/bring-your-own-device-byod/customer/bring-your-own-android.html but its still no good.