I am using the stock app for my SMS text messaging. I have noticed that several message threads are showing a date of Dec 31, 1969. I am unable to delete these from my history. The program allows me to enter the delete field, but when I attempt to delete these messages, nothing happens and they stay in my history. Any ideas on how to delete these messages from within this app. I have new messages show up on occasion, that were not in there before. There are about 35 threads currently at this point that I need to delete. I appreciate any help with this.