Why does my iPhone4 Voice Control activate randomly?

My experience says that it is happening with you just because of the headphone is built in your mic. Voice control is also getting activated by exterior noise there. You can solve this problem if you will be able to close your t microphone hole by just one small tape. I have solved my own problem by this trick. You can also use old headphone because they do not have inbuilt mic . You can also use IPod headphone wiith you iphone.

Problem is with your voice control but stitching tape to closse mic hole looks ugly. You should use iPod headphone because they do not carry mic. You can also solve your problem by resetting your mobile. My brother was not ready to use headphone without microphone so he reset his mobile and now he is not getting this problem. If mic is not important then go for ipod headphone.