Why isn't my iphone taking pictures anymore?

Basically I have an iphone 3 and before the camera worked fine but now when i load it it takes ages for the grey shutter to open than usual and then when i press the take picture it just goes back to the grey shutter and then reopens after like 30 seconds.
Anyone know anything?

If you have a lot of apps, pictures, videos, or music take them off. You may have slowed it down too much

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