> For her, the network effect is incredibly strong: all her friends and family are on Verizon, so she is very hesitant to switch as she gets the in-network minu

> For her, the network effect is incredibly strong: all her friends and family are on Verizon, so she is very hesitant to switch as she gets the in-network minutes free. Sprint has unlimited mobile to mobile for plans with data, so as long as the other person is on a mobile line (probable since they are on Verizon), the call is free.