This is not a service we provide. It is not a service we have ever provided, nor a service we have any plans to provide. Indeed, it is a not a service we are technically capable of providing.

I'm curious: why not? It seems like a lot of people would be interested in this if you could figure out how to provide it.

How would this work?

If a phone number is for a mobile phone then looking up the location doesn't make sense at all: mobile phones are mobile.

I guess you could try and crawl an index of business phone numbers and associate those with the listed address for businesses, but that's a completely different business from running a geocoder.

You could provide a bit of geographical information about the first three digits of a US phone number. I imagine that's not what users are actually looking for though.

Phone numbers have geographic structure. For mobile phones it's just the area code, but for landlines there is also information in the exchange portion. For example, I grew up in Medford MA which is 781-39x-xxxx.

I expect there are also patterns in other countries?