I have used the iPhone 4 in December 2013. bought - so at times, where it already had the iPhone 5S. The Apple fans are determined to call 1000 Reasons why it should be a newer - but honestly, for the normal calls, chat, surf, etc. is this phone more than adequate.
I like the iPhone's ease of use, fast response, the graphical display and the battery life (compared to my previous HTC). Who needs a solid and quaitatives smartphone, is well advised with this 4p here.