Low-cost 3G interface for Raspberry Pi?

Tom wrote 11/21/2016 at 16:21 1 point

What's the cheapest way of getting 3G onto a Raspberry Pi?

I'm designing my own hat for it anyway, so placing a SIM5320 or similar on the board is not out of the question, though I'm not that confident about getting the RF traces right.  But the cheapest I can source them is over £20. - and since I can get a USB 3G dongle for about that anyway, there doesn't seem a lot of point.  To get one on a breakout board that doesn't require me to do RF design is looking rather nearer £60.

There are a variety of SIM800 breakout boards which look pretty easy to integrate and which can be had for less than £10, but AFAICT they are 2G only - and we move too much data around for that to work.

mini-PCIe 3G modules designed for a laptop are easy to come by for about £10, but of course the Pi has no PCIe bus.

What other options have I got?  Am I really best off sticking with my USB dongle?