If I update my iPhone 4S to iOS 7.1 will I loose the data in my apps?

Well I have never updated and I do know that it won't delete your apps but I was wondering, if it will delete the stuff in the apps ;I have this app called music Download thats were i get all my music from and I'm afraid that if I update I might lose all my music INSTAGRAM @dinosaur_face BTW::-)

Nope it won't get rid of your data at all…
but you may want to be careful since your iPhone is an older make compared to the others… So it may or may not make your iPhone slower…;)

Mine didn't break I'm anyway, worked perfectly since the release of iOS 7, if you're worried about it getting rid of your music, back it up somewhere on your computer and then put it back onto your phone. Windows isn't great with handling phones so you may have difficulty linking your iPhone to it but there's bound to be plenty of tutorials explaining how. Of you have a mac however then you're sorted!

Maybe not the same, but I tried to update an iphone4 to 7.1 and this crashed the phone. When I took it to Apple, I was told nothing could be done, and the phone was useless. Even though the download caused the problem, I was only offered a new iPhone4
at half price.