Tell her that if the teacher sees her texting and takes her phone away for the remainder of the school day (or some other punishment like that) then you're going to take it away for a month. I did that once with my son and he never used it in school again.

Why don't you do random checks of her call log? Don't tell her you're doing it (so she won't go erasing the evidence). If you find something that worries you then tell her you looked at it and you found something that you're concerned about and you want to know what's going on.

Hopefully you have a good relationship with your daughter. That helps prevent acting out in destructive ways. Follow the 90-10 Rule (see Raise Your Kids without Raising Your Voice or the free download on this site called The 80-20 Rule) to help strengthen the bond. Then, make sure you are talking about the dangers of meeting and dating strangers - just bring the subject up in various ways at the dinner table - don't lecture her directly. Talk about things you've read or heard on the news or saw on T.V. and raise them for discussion. Your goal is to help her have enough of her OWN fear that she will keep herself safe. Checking her call log is a good idea also. Try to keep her busy with constructive activities but don't keep her on a really tight leash because kids her have no freedom have the greatest urge to break free in dangerous ways. Basically try to teach her to make good choices and choose her friends wisely. The public library may have some good books for teens on the dangers lurking out there - date rape, drugs, alcohol and all the rest. You can bring such materials home and leave them around for her to "find." That way, you don't have to lecture and preach yourself. It can be scary to raise a teenager in today's world. Trying to deprive them of today's toys, however, isn't the way to protect them. Rather, aim to teach them to be responsible users of modern technology. If you can join a parenting group focusing on teen issues, you would find more ideas there as well.   All the best,  Sarah Chana

My daughter now 17 used to do the same thing. I explained to her that the only reason we gave her the phone was so we could get in touch with her when she wasn't home i.e. friends house, mall etc. or if there was an emergency of her part and she needed to call us.  We then would have her hand her phone over to us every evening when we got home and put it away and give it back to her the next morning.  We also told her that if she was caught using it in school she would lose it permenantly.  Her only option was using the landline and we limited her calls to 10 minutes and only 1 or 2 calls could be made per night.  It worked.