I'm a little confused. I was interested in adding the 9.99 data plan to my multimedia phone since I already have vznavagator and have already used over 4 mg with that feature in a months time. We have had the basic voice plan with family share minutes for just over six months. My question is if I add the data plan to my phone will my husband's phone then require a data plan? He would never use it. Also could I do this online or on my phone? Thank you in advance.