Samsung may not be the best when it comes to redesigning their devices (hopefully that will change with Galaxy Note 4), but they do have a knack for including some pretty awesome features into their TouchWiz software.
In its latest version, the one that shipped with the Galaxy S5, they included Download Booster. This feature uses both your mobile data and Wi-Fi to increase your download speeds for files (but not streaming, unfortunately).
While we can't grab the official Download Booster on our HTC One, there is a very similar app that does the same thing called Super Download, which kicks in right when a download starts. That means there is not much set up needed once installed.
A Big Thanks To the GadgetHacks ( For his awesome Tutorial)
Step 1: Install Super Download
Super Download is the work of developer @elban , who has been kind enough to release a fully featured free version of this app for XDA members, which you can grab over in his thread. If you're not on XDA, you can also grab a free version on Google Play, which has a 50MB file size limit, as well as the full paid version. Those links are below.
Super Download Lite - Booster
Super Download - Booster
The free .apk from XDA will install like normal as long as you have installation from "Unknown sources" enabled.
Now when you download a file through Chrome or any other browser, Super Download will kick in and activate both your mobile and Wi-Fi data. You can also share download links to Super Download by using the share button from any app.