I recently downloaded the Majicjack andriod app on my Driod Bionic on Verizon Wireless.
Note on the screen says it works best with wifi or LTE connectivity.
Service works perfectly at home on my wifi. However. When I turn off my wifi and having only LTE connectivity on my 4G phone, having the Majicjack app running causing my strong LTE signals to "disappear" and thus, I can't make a majicjack call while using LTE.