Here are some the best fixes and feature enhancement tools that I have found for my magicJack. You will not find these on magicjack.com and magicJack customer support will probably not inform you of their existence. These tools have enable me to run my magicJack reliably and in a manner that suits my needs, instead of what magicJack believes I need.
a.fixes the problem of not being able to turn off voicemail
b. fixes the problem of magicJack's window popping when you receive a call
c. allows to block call based on Caller ID information
d. has a do not disturb feature that directs incoming calls directly to voicemail