My iphone won't connect to anything via USB cord

I was using my phone connected to my computer via USB cord then i took it out for a little while then tried to put it back it and it isn't working! I tried 2 different cables plugged into my computer and charger but nothing works. The phone won't connect.anyone know what's wrong?

If you unpluged the pho from the usb with the power on, you may have inadvertantly turnd off it's usb on mode. Check your menu and/or owners manual for the usb settings.

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