As a parent of 3-teenagers, I can definitely relate on having to set limits on kids' phones, jarzack. We have a great feature/application called Family Base. With Family Base, you can set data limits, voice limits, message limits, blocked or trusted contacts, and time restrictions. It is absolutely fantastic!
Family Base is free for 30-days, but it is $4.99 per month. You can get all details here: http://vz.to/2miFrSz
I hope this is beneficial.
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