go to your aps and find text messages icon open it, then pick your contact , touch the contact that you wish to delet messages with.... then to the left at the bottom of your phone hit the 4 square box next to the house ......then you can delete one or select multiple of each message will be a little white box tap each box you wish to deleet it will hilight in green when done go to bottom of messages and hit delete sounds like a lot but once you do it its simple and fast i put my text messages icon on my home screen makes it faster im going to post a video on how to do this soon! I sure hope this helps alot of people!