I've had the Nexus 4 for about a month now and i haven't had a problem until this yesterday. When i turn on my mobile data, i lose my signal. It just stops working. My phone then just becomes useless. The Wi-Fi still works fine and is the only way i can connect to the internet on my phone. Anyone know what to do to fix this? I'm on Andriod 4.3. Tried reboots and airplane mode. Nothing. Any help would be greatly appreciated