Spring is laying down the game like crazy right now. They're charging their customers MORE, to get proper service that they should be providing you in the first place. This is like hiring a maid and he charges you extra to sweep your rooms, clean the sinks and toilets and showers, etc... That's his job (i'm politically correct).
Sprint has released a signal booster base station for 100 bucks, then an extra 5 dollars on your phone bill. It is for people who don't get good reception at home. Instead of upgrading their whole system like any phone company should be doing, they release this to get around spending money to have a legitimate network.
Have fun getting conned by Sprint peopleFrom Phonescoop