Broadband without landline

After not using our landline for a year, we only use mobiles, I decided to get rid of it.
I purchased a 4G router for around £90 and signed up with 3 for their £20 a month unlimited data. After one month I can confirm that 4G broadband is perfectly acceptable for most uses. We extensively brows, email and download. In the evening we watch online TV services and mostly have several devices running. I initially purchased PAYG sims to find the best network.
I get around 38mb download and 28mb upload speeds and certainly in this first month have not had any interruptions. We are in a rural area with quite poor mobile reception.
So it is now possible to get rid of your unwanted landline and still enjoy a good broadband service. My total monthly cost is £20 if I move I just take it with me.