Why can't I get on any apps or my internet without Wi-Fi or 3G on my iPhone 4s?

Like my iPhone usually lets me get on any app, like Facebook, Instagram, Youtube, Pandora etc. With 3G. Now, unless I have Wi-Fi, i can't do anything.
what's wrong with my phone?

Must be disconnected.

Because you don't have an Iphone 5

You need to check your 3G connection. So try opening safari and loading up a known good page. So not just your home page which can be saved in the cache. Try a different web site. If it doesn't connect to the new site, and it says you have 3G, you are looking at a hardware issue. However, if you connect through to the new site, then try the app again. If you can't get into the app but still have 3G, then you should do a restore on your software as the apps are not working.

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