****** hugs}}}
Please be safe, you never know if and how an addict will flip when you interfere with their addiction (whatever it might be).
You might also look into Boost mobile. I got unlimited everything for 40 dollars a month and a Samsung galaxy rush.
From there, what you can do is root your device (I could help you with that) and use it as a modem to send a wifi signal to your laptop.
Or even better you could use pdanet and use your phone as a broadband for your computer: there would be no need for rooting and because the connection would be through USB your son would never see a signal.
Let me know if you want to go that route, I ll be more than happy to give you a step by step guide.