How to call Guyana from USA?

The number I was given is 1-868-784-0*** (I'm only hiding the last three numbers so no weirdos calls). I found a website that said to dial 011 + 592 + area code + phone number. But the number I'm trying to call is a cell phone number. For cell phones the website said to dial 011 + 592 + 6?? ????. I've... show more The number I was given is 1-868-784-0*** (I'm only hiding the last three numbers so no weirdos calls). I found a website that said to dial 011 + 592 + area code + phone number. But the number I'm trying to call is a cell phone number. For cell phones the website said to dial 011 + 592 + 6?? ????. I've tried both, and failing. I have no idea what I'm doing wrong! Can someone pleeease help me? It's important.
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