My 16 year old son, saved for and purchased a HTC Thunderbolt with 4G capabilities. When I try to put in usage controls (has been texting in class), it tells me that I can't use them on his phone. I have contacted Verizon, the tech I talked to couldn't help and was going to put in a ticket for follow-up. I was told that I would be contacted but it has been over 2 months and I haven't heard anything. Anyone know why usage controls can't be used on his phone?