You may b able to cause u not upgrading ur phone per say. But the share everything was a bit cheaper than having separate bills me & my daughter currently has ip4 my husband bb & my son a dare with 4g a month, unlimited texting & calling my daughter has Netflix going all the time on her phone, I'm on my Internet all the time & so is my husband , I also tether my iPad mini and not even 2 gigs is used by the end of the month .
and it will only be $10 plus tax a month for her line but she will need a phone to use as well if the prepay don't transfer over or if mom is happy with her pre pay just add a line for $10 plus tax & put a dummy phone on the line it's called alternative upgrade
That's is what I plan to try. Add her prepaid phone for $10 a month switch GN2 to my line and she can keep her prepaid or take my old voyager and sell my maxx.