Leo likes Google Voice because it allows you to forward your phone to all your phones. It’ll also receive faxes and give you a transcript of your voicemail (now this isn’t all that great, but you can usually figure it out). There are paid services like Ring Central, which is good for business, but doesn’t make sense for a person. Grasshopper is a bit cheaper and works for individuals, but Google Voice is free.
Since Tom's phone seemed to stop working with Google Voice, Leo suggests that Tom go back to the Google Voice settings, delete the phone and reattach it. That may resolve the issue, but the chatroom says that Tom’s problems with Google Voice are a known issue with his Sprint service.