[tsac]

The changes are both for network overload issues and for raising income. Most customers donxxx8217;t really know what they use so a lot will select the add-on to cover what they perceive they use.
Also switching carriers may be a waste of time . They will all have some form of limit. Remember they have agreements to provide interoperability( roaming ) and if one is overloading the network sharing the other will start to limit the use. This will give the customer the impression their company is having problems and some customers will move. SO the major carriers will all eventually do the same. Itxxx8217;s an endless cycle

Edit,
ATT, Verizon and T-mobile are all expanding their networks to allow expanded data use.