I have only had my iphone 4 two weeks, but today I noticed a problem for the first time... Whenever I text one of my contacts that has an iPhone, for some reason their name disappears from the messages screen. At the top of the screen, where it should list a person's name, it lists their phone number instead. It has become quite annoying in that I now have to actually memorize the phone numbers of those that I am texting if they have an iPhone. Any suggestions to get the contacts back to normal? I have the most recent update. Any ideas would be greatly appreciated!