Dual active LTE + multipath tcp + VPN I travel a lot and having a constantly reliable Internet connection is high on my priority list.  Tethering from my phone is often times spotty.  Different carriers are good in some areas and poor in others.  To further complicate things, sometimes even a good connection can randomly hike packet loss rates and response times.

I'm searching for a solution.  Something with much more reliability and consistency to tether my laptop to.  I'm willing to pay for multiple carriers.  I figure I can set something up with multiple sims that supports multipath tcp and then use a VPN connection to a AWS EC2 instance I setup and control.

So what I'm looking for is a dual active sim device that supports simultaneous LTE on both sims.  So the first part of the question is what hardware device supports this?

According to Wikipedia there's a multipath TCP networking layer for Android.  Is this standard in the latest version of Android or is this something I have to manually install?

I figure Android is a good way to accomplish this goal, but in the event that the hardware just isn't available, is there a non-Android solution that would accomplish the same thing while being as portable as a phone?  I've seen professional units that accomplish this but they're bulky and have external power requirements that wouldn't fit in my pocket.
Android's multipath TCP networking layer is only able to use WiFi and Cellular concurrently and can't use multiple of the same connections at once (as far as I know).

However. You can use a mobile WiFi Router from Huawei for example. To get a seamless LTE and WiFi over LTE connection. The Huawei router is very fast and as big as my phone so very easy to carry. It offers about 8 hours of coverage but they have models that are slightly bigger that offer 20 hours.

This way you can use for example Samsung's download boost to use LTE and Wifi at the same time to get double the speeds/reliability. I would suggest you get sim cards from 2 major different providers for extra reliability so if one is under maintenance/has low coverage you can rely on the other.

I hope this helped if you have more questions feel free to ask.

*If you want to double your speed you might also want to look into NIC teaming I think this only works on windows / pc's though