The service can also be used to restrict mobile data use and messaging during certain times of day and to create lists of blocked and "trusted" numbers. (Calls to 911 will always be allowed to connect.) Usage Controls costs $4.99 a month per line and requires Verizon subscribers have a nationwide calling plan.
Earlier this month, T-Mobile USA launched its Family Allowances program, which lets parents set an upfront monthly amount for teens to spend on
minutes, messaging and multimedia downloads.--Mark Walsh