I've had my 4S since it came out on fall of 2011. In the last 6 months I've noticed it's become incredibly slow and lags. Opening and using apps, especially Messages and Safari have slowed down significantly. It takes a solid second or two longer to execute tasks that before were very snappy. Sending a text, launching an app, performing searches. What could possibly be slowing my phone down so much? I read that deleting all of your texts helps. Is this true? If so, how much? I like the shape and size of the 4S as well as the design, and would prefer to keep this a little longer if I could but the lagginess has become very frustrating. What do you suggest?