Magic jack is damaged - Linksys SPA-2102 NA Analog VoIP Adapter (2) FXS, (2) RJ45 (SPA2102-NA)

The reason why your Magic Jack isn't working now could be that Century Link has updated their modem, and the new modem is incompatible with the Magic Jack. Another possibility is that the Magic Jack itself is no longer working.

If I were to troubleshoot this problem, I would first try plugging the Magic Jack into a different modem to see if that works. If the Magic Jack still doesn't work, then I would contact customer support for Magic Jack to see if they can help me troubleshoot the problem.
I hope this helps.

If your tv has internet access and you can run their software on it then it will, otherwise no.

Well, you'd best go to Magic Jack's web site, and either log in to your sister's account and cancel it, or try to find a Magic Jack customer support telephone number and make the call.

...and did you check your internet connection or visit customer care at magicjack.com? Why are you asking about it here?

This video very clearly explains how to renew your Magic Jack subscription:
Magic Jack Renewal Process Very Important Information

If you have an old Magic Jack, my 4 unit are 6 years old the company just really wants you to upgrade to a newer product no need to. Try removing Magic Jack completely from your tablet, restart unit, make sure to clean out all junk on tablet from Magic Jack you could try a program that cleans your tablet for you, but unless you know what to remove don't get technical just a standard clean up of old files, this is usually under apps, Magic Jack, then there will be a clear cash button, clear data, and uninstall.
Restart unit then do a fresh install of Magic Jacks new app for your type of tablet from Googles sight or Magic Jacks make sure if you have a Mac to install the Mac App and if you have an android tablet you install the Android App. This has been working for me. With the old Magic Jack you will need to do a fresh install when you get errors and crashes. I do it 2 or 3 times a year. Good Luck!!

Magic Jack will work with fax machines. You may have to experiment by slowing down the fax machines modem transmits speed. This is done in the machines menu.

The Magic Jack manual is quite clear, it can handle faxing.

It won't help. Magic Jack is DIGITAL your fax machine is ANALOG