We've been using a 4g router for the past several years. Broadband on the landline was, at best, 2 mbps - when it worked. It took a bit of courage to abandon the landline totally but with a good 4g signal we get 30 mbps and only have mobiles for phone calls. We are in UK but the principle is the same.

I wouldn't think twice about abandoning your landline if you are that close to a mast.

And when the mast is upgraded to 5g you'll be at the cutting edge (but will need to upgrade from a 4g to a 5g router).

For a year now I have simply been using my smartphone as a wi-fi hotspot in my new home and also during my frequent removal visits in the UK, I get better speed than my fixed ADSL at the other place and have never gone anywhere close to reaching my monthly data limit.

My pal is urging me to get a 4G router, he is right on most things tech wise and drags me into the 21st century but in this instance I cannot see any advantage for me at this time.

So far I have only experienced ons situation where a 4g router would have helped and can think of one other potential one.

If I were to have CCTV cameras and wanted the ability to view remotely like I can with the hôtel then I would need a router either via ADSL or 4G, 4G being cheaper.

I have a domotique smart switch to configure via an app, the phone is supposed to communicate with the switch via a wi-fi network but the phone is the wi-fi hotspot so I would need a second smartphone and Sim or a 4 router and Sim or the ADSL router, seemingly I can also program the switch via Bluetooth although its not co-operating with me at present.

I dont think I will ever have another ADSL or Fibre Optique connection unless they bring the price down, in the early days €29.99 for telephone, ADSL, mobile phone (2 hour contract) and television was a good deal but times have changed, now with the Government tax its €2 more for television and you can get all the same channels from the antenne, I think a 4G router is the way forward but you can just use the hotspot if you have a smartphone and avoid paying a monthly charge for a second sim.

At the moment we pay for a landline and ADSL broadband for a total of about 42€ per month. The maximum data rate is 8 Mbps and this seems to be attained when there is no line fault. The 4G Home solution claims to be as high as 300Mbps and would cost 35€ per month. We will never get fibre in such an isolated position.
  Recently I switched my mobile from Vodafone to Smarty to avoid roaming charges. Data from Smarty costs very little but it specifies that I can’t use my phone as a hotspot outside the UK.
  I always worry about losing the land line but realistically the only calls we receive direct to our house phone are from a variety of scammers and other annoying sales people. All our regular friends and family use the usual mobile and/ or internet routes.

Thanks everyone for your helpful and informative replies.

Looks more like €8 per month with the first year at €3 per month for 100 gigawotsits.

Orange / Buoygues are usually in the 20-30 euros a month depending on offers. Includes the box SIM etc - buoygues is definitely unlimited data.

An LTE router is 80-180 euros depending on what's on offer and if you want a known name or cheap Chinese (that works just as well). SIM deals are plentiful - but 10-20 euros a month gets 100-200GB as a rough guide.

I've had Orange 4G Home since moving house as the ADSL connection was painfully slow. It works well, 200 Go per month which is fine for me but I'm paying 36.99€ per month so am shocked to see some of the prices quoted above. Will look into this!