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If I started to try to do this... is there a page somewhere that explains how to actually build a module and use it?

I was actually looking at these:
https://nimbelink.com/skywire-cellular-m­odem-lte/

They seem to have multiple modems 2g, 3g, 4g, and the one in the link has a TNAG which has fallback from lte all the way back to 2g. My problem is that I have no idea how I would actually communicate with this? Would I just open the serial port and send AT commands or would the sim900 library in theory work for this modem as well?

We have been working with a pico and original espruino on a project and I LOVE them. We have used pi, beaglebone, olimex, etc... and so far the espruino is my favorite.

For our project we need to connect to the internet via cellular. I am going to attempt to use the sim900 module with a sim900 board that I have but as you probably are aware 2g is being sunset by AT&T Jan 2017 and the other carriers will probably follow that lead.

Is there a module yet to communicate with a 3g/4g/lte modem? I know the tessle now has support for a usb Huawei E303 3g modem.

This is an area I'm not that sharp in. If we find a serial interfaced 3g modem.... is there a module that would allow us to leverage that modem to connect to the internet?