Not just the same area code, but same exchange/prefix....that's when I know for sure that's a scam
I no longer live in the area code, so that's suspicious to start, but never even knew but one person with the same prefix (also a cell phone)...I think we'd purchased from the same phone store.
My biggest spam caller is an actual company that quoted me for a new roof (and long ago went with someone else)....very persistent and always from the same number, so I'm just amused. They're calling me at least twice a day....but haven't blocked it yet as I want to see how long that person is going to have the job of calling me.