Hi there Stewart and welcome
The discontinued the phone and repairs on it are not possible. It is also not possible to purchase it as it is not available anywhere.
But there is software that you can use on your computer or smartphone to replicate the functionality the screenphone had.
This will be for the time being as close as you can come to a solution.
You can see the information about this and the location to download it from my link below
It will explain to you the different options that you have.
If you would like any additional information or assistance, please do not hesitate to let me know.
Else if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.