Why has my iPhone 4S removed apps?

I was on my phone then it crashed so I turned it off then back on and most of my apps had been removed like my message, call, Facebook, settings all the important ones, when someone sends a text it'll pop up on the top but I can't click it, when I go into contacts it won't let me ring or text anyone, but I can answer incoming calls, I don't know what version my phone is on but I haven't upgraded it in a while as I haven't had enough memory does anyone knows what's going on? As I've lost my photo album and that's the main thing I'm worrying about, also I don't have a laptop so can't plug it in to have a look:/ please help.

Gee, I think it was the crash.

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