The LG G Pad X 10.1 isn't the most notable tablet in the world. Its specs are middling at best, its styling is inoffensive, and it isn't any particular bargain. But it does have one claim to fame, at least if you have the AT&T LTE version: it's the first tablet to support NumberSync, the service that allows users to seamlessly use one number across multiple devices for phone calls and texts. Previously the service was limited to Apple devices (piggybacking off of Apple ID) and the Samsung Gear S2 smartwatch.
To use NumberSync, users will need to upgrade their tablets to the latest over-the-air firmware, which AT&T says is rolling out now. Once it's downloaded and installed, a Phone dialer app will appear on the tablet. Assuming you have an HD Voice compatible phone on AT&T, simply follow the on-screen prompts to set up number sharing.
As with most of AT&T's software updates, you need a Wi-Fi connection to download the 300MB file, and it may be a week or so before the staged rollout reaches you. The Android version hasn't been updated (it's still 5.1.1), though the OTA does include "security updates." At the moment the G Pad X 10.1 is AT&T's only Android tablet with NumberSync, but expect the others to be supported as more updates are released.