Hi, if you want to keep a ringtone but your teacher don't want to listen to then I just have a ring tone called Mosquito ringtone. It produces a signal which only younger people can hear but elders don't. So what is the actual fact behind this? K let me tell you in detailed. Generally as age grows the listening capacity of high frequency sounds for persons deteriorates. That means they barely hear any high frequency sounds. This ring tone will provide you such high frequency sound and hence only teens can hear that sound. So we can keep it as our ringtone and only we can hear but not the teacher.Download this ringtone now and enjoy.