Some LG smartphones are affected by T-Mobile bug

Some LG smartphones are affected by a T-Mobile bug that caused the "LG IMS" app to crash and persistently display an error message. Restarting the device should fix the issue, but for those who do not restart their devices, the issue should be resolved within a day. The cause of the issue was a change T-Mobile made to its systems that affected LG devices connected to the carrier.

T-Mobile has offered an explanation for the software error that prevented some of its customers from making or receiving calls on their LG smartphones. According to the carrier, the issue was caused by a change to its systems that affected the LG devices connected to the carrier. The app that displayed the error, LG IMS, is a system protocol used to handle data and voice connections over LTE. This component of LG’s firmware was briefly broken, causing these devices to become unable to make calls or use their device with the message constantly in the way. 

T-Mobile has acknowledged the issue and is working on a resolution. In the meantime, restarting your device should fix the problem. If it doesn't, the issue should resolve itself within a day. We will update this article when a permanent solution is found.