It’s going to be pretty difficult to give you a definitive answer for this one - either you’ve only given us half of an area code, or the code isn’t in use anymore!
+171 For London, England
+171
used to be the calling code for certain places in London, England. It’s been out of use for years, though, so we can pretty much rule this one out.
+1 For USA, Canada, and the Caribbean
+1 is the number used at the beginning of American, Canadian and Caribbean numbers, but it isn’t actually an area code.
However, the number could have been
1-71_-???-????, in which case you’ve only given us two digits of the area code - if this is the case, I can’t really help you track down your mystery caller!
You could always try calling your operator and asking where the calls are coming from. If not, just try answering the phone next time it rings, and ask the person yourself.
