Need Help Reader board help

I am working on an electronic reader board.
It uses a phone line to access the system to change the letters and graphics
the software is watchfire by Timeomatic

Is there a system out there to eliminate the phone line. Is there an adapter to access this system via blue tooth etc to get rid of the phone line?

What is an alternative so the owner an get rid of the phone line and going to wireless?
This would include if necessary obtaining a new system.

Approx 4x8 reader board.