3G/4G/LTE modem support

[rmackay9]

Allow telemetry and video to be streamed via the internet using a 3G/LTE modem.

[KevinKW87]

I tried to get 3G/4G LTE working last month, but had little success. I had an OpenVPN server running on an AWS instance and I could connect with my Windows client, but not my RPi3. Here was my error when I attempted to load up the .ovpn file on the RPi3:

Notice the OpenSSL version at 1.0.1t. On the server it was 1.0.2k. so the RPi3 is horribly out of date and from reading through some of the Pi forums, this is a known issue and there isn't an easy fix.

I would really like a cellular method that goes to an AWS server so we have that static IP to work with and I could connect anywhere, with any device via UDP as long as I know what the IP address is. I'm not a network guru, but I'm willing to throw enough money at this to get a working tutorial for APSync.
Edit: I donated $50 as a starting point, more coming when it works :)