3G/4G routers

[matchmaker]

A bit of help needed. I'm trying to set up a broadband link for a construction site. Due to length of the contract and the installation costs, a fixed line is out of the question so I want to use a 3G or 4G router. Anyone have any experience of using one? I don't want to spend a fortune, but do need a reliable one. It'll be attached to an external antenna.

[matchmaker]

There will be several users plus a printer which will connect via wired ethernet. There will be a need for a vpn connection to head office.

[matchmaker]

Back to this thread - we have been using a Proroute H820 3G/4G router for a few days now and it seems to be doing the job. Does anyone else have any experience of this router or the H685 (same guts, but only 1 LAN port)