how to get telephone number from google by submitting company name and address?

A customer asked me a simple app that retrieves the telephone number开发者_JAVA技巧 given the full address of a company.

So imagine a simple edit box where I type

Dummy Company ltd - 143, High Road, 519243 DummyCity, DU - DummyCountry

and I ask "google" or something else and I get the telephone number as answer.

Of course I need to do this for many customers at once, but if I can do it for 1 it is easy to extend.

Did anyone already implemented something like this?

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Why dont you try to contact the "yellow pages" in your region and ask them, guess they provide such an API, take a look at the canadian one for example