Here's the the changes and features of the 4.1.2 Jelly Bean.
This software update will also give you easy access to the following useful apps:
- AT&T Locker – Allows you to automatically store photos, videos and documents securely in the cloud, so you can access and share from your smartphone or computer.
- AT&T DriveMode® - Helps curb texting and driving. The app can be set-up to automatically send a customizable reply to incoming messages once a vehicle starts moving 25 mph. The auto-reply message is similar to an “out-of-office alert” and can reply to texts, emails and wireless callers letting your friends know that you are driving and unable to respond.*
- AT&T Messages – Displays all your texts, calls, and voicemail messages together in a single inbox, easily accessible from your computer, tablet, or mobile phone.
Again this update is push via OTA (over the air), AT&T's says HTC One X users need to connect the device to Wi-Fi and then just simply tap on Applications >> Settings>>About Phone, then Check for Updates.