If its a landline, the area code and following three digits can tell you the metropolitan area and what town or neighborhood- e.g. , everyone in my hometown had the 716 area code and the first three of the seven digits were 692, 693, 694, or 695. If I saw a different 3-digit exchange, I knew it was from another town.

However, these days, numbers can be ported, meaning they can be assigned to voice over internet protocol (VoIP) phones, or cell phones, both of which could literally be anywhere on Earth (or even off Earth if there weee an internet connection or cell phone signal). Google Voice will give you a free number pretty much anywhere in the US, so if I wanted to have , say, a Salt Lake City phone number with a downtown exchange, I probably could get one, without ever visiting that city. Or I could port my number from San Francisco to SLC if I moved there, making it look like I was in my old neighborhood. So a phone number is not a guaranteed indicator of someones address.

Neither is a mailing address - private mailboxes and remailing services are easy to obtain. Youd have to visit to verify someone really lives or works at a given address.