IPhone 5S Cellular Data issue?

Every time I try to open an app that uses Wi-Fi or data it says " *so&so app* has not been given access to cellular data" or something along those lines & doesn't let me access the Wi-Fi data…

I'm pretty sure it's not that my connection is weak because I'm literally using the Safari right now through the data

So how come it won't let me use the data on other apps?
I've gone to settings to turn the app on for the data & allow access to the data but it still doesn't work!

What's the issue here?

Well make sure that you have Cellular Data on and that your apps can use it. If this does not work, i would recommend backing up your phone in itunes and restoring the iphone.