Switch to Fiber and keep (for now) PSTN line

[#1]

We have no mobile signal no fibre in our area and our copper wire broadband is useless, certainly not reliable enough for reliable VOIP. What happens when the our PSTN is removed ? 

[#2]

@kittyhawk 

To help advise can you post a screen image of the results from the following. Include the narrative but hide your details.

https://www.broadbandchecker.btwholesale.com/#/ADSL

To post inline you click on the reply button and then on the menu link that looks like this.

Brian

[#3]

Real life 

Download speed 7

Upload speed .. non existent