Something they are always omitting - cost. If this costs more than a fixed line internet then they can, as far as I am concerned, forget it.
A couple of months ago while on holiday, I had need of getting on line using a 4G modem. It was limited in the amount I could download and the cost was more than double my fixed line internet.
It might be of use for the occasional connection via a phone but not for serious SOHO use.