My iPhone dosnt wanna play videos or work on apps how do I fix it?

Hey guys my iPhone 4s keeps freezing when I watch videos and my apps go really slow i've tried everything how do I fix this? Do I call my carrier

Try to do a hard restart. This usually works for me. Hold the sleep button until the phone goes off. The screen to slide to turn off will come on but don't do that. Just keep holding the sleep button. When it goes off just hold it again to turn back on. An apple should pop up. Hope that helps.

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