The iPhone 4 was a huge feat in engineering for its time on both a software and hardware level. However, several years later, the iPhone 4, and even the iPhone 4s, just don't run newer software the way they used to. For many people, iOS 7 really caused the iPhone 4 and iPhone 4s to show their age. Luckily, we've got some tips and tricks to hopefully help you speed things up and kick some of that lag to the curb if a simple reboot isn't doing it for you anymore...
Full story from the iMore Blog...