My iPhone 4 lock/sleep button is not working?

I don't know what to do, should I go to my phone company or an Apple Store. This problem started yesterday.

I had this same problem before I fixed it. It's probably due to the fact of how hard you were pushing it and its to the point where the button is stuck inside the phone. You can either do this the DIY way, which involves a screwdriver & taking off the back of your phone, or you can take it to the Apple store. They will charge you a minor fee, but it's better than calling your company and asking them to send another for a ridiculous price.

To fix it you can just go to settings> general> Accessibility>assistive touch, then tap on that weird circlely thing> then go to devises and then lock screen!
But if i were you, id go to the apple store to fix the button
Hope this helps.

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