How can I add multipath TCP ability to my nexus 5? I want to be able to connect to my wifi and mobile data plan simultaneously, I've heard that this is possible through MutlipathTCP , and that the support of this protocol has been built in android OS. How can I add it to my Nexus 5 ?
First you will need a multipath TCP enabled Nexus 5, which means:


rooted
with Android 4.4
with the kernel developed to enable MPTCP (available here)


Then you will need to subscribe as an alpha tester for an app that lets you use WiFi and cellular network at the same time. Note, though, that it is deprecated. You can find all the useful links at the end of the page I linked.