Download Booster was one of the coolest features from the Galaxy S5, and it’s back with the Galaxy S6/S6 Edge.
However, it’s off by default and buried in the settings. When enabled, Download Booster combines the Wi-Fi and LTE connection to download large files faster than either connection could on its own.
To access Download Booster, open up Settings and go to More connection settings > Download Booster.
Turn it on and get ready for faster downloads. If this setting isn’t present, guess what? Your carrier made Samsung remove it. In fairness, Download Booster can gobble up a lot of data if you’re not paying attention.