How to boost download speeds on mobile?

I was wondering whether there are any mechanisms available to boost the download speeds on mobile phones. There's software like '<a href="https://www.crazyengineers.com/threads/connectify-dispatch-ready-to-combine-your-internet-connections.66852">Connectify Dispatch Ready To Combine Your Internet Connections</a>' that combines all your accessible Internet connections into one solid connection and increase the download speeds. I haven't seen anything similar on Android or iOS yet.

If you know any such app that lets you join multiple networks (multiple WiFi + 3G) to form a thick connection that combines the speeds of all these networks, please let me know.