Mobile phone SIM in 4G router
We live in a rural area and are looking for a way out of the constant slow broadband and terrible service from broadband providers. We’re thinking about getting a 4g router because we get good 4g here. We want unlimited data. I’m confused about the cost though. I’ve read a Which report which says that it will be much more expensive than broadband because providers impose strict data limits on tethering and charge swinging amounts for going over the limit. Presumably you buy a data-only SIM from them, and a 4g router comes with it. But I’ve seen unlocked routers on Amazon, and found other people saying that they use a mobile phone SIM in their 4g router with no trouble at all. In that case, how can a provider tell that you’re using the SIM as a wifi device rather than in a phone, and enforce data limits? Have I missed something?