Whoever hung up the Courtesy Phone really wasn't being very courteous.
And stopping to check directions once along your route is far too many times.
...so this was the solution.
Had a slight reception issue with my Samsung Galaxy and after a couple of moments of research, I decided to repair it... A length of copper wire and a roll of sticky tape later, it works better than before, believe it or not.
Old Phone + VoIP ATA Adapter + PoE Adapter = I can use my phone again!