Who I have the same questioned this topic

I recently broke my Droid Maxx.  I activated an old basic phone I had from 5 years ago and I am going to be charged an additional $30 a month on top of paying $40 a month for my edge program.  When I activated the phone, I switched the devices, I did not add a new line.  In the mean time I ordered another Droid Maxx that I would like to activate but I don't want to end up paying an additional $40 for that phone.  Am I going to have to pay an extra monthly payment no matter what phone I activate because I have the edge plan?