In applications sometimes is needed check and verify if a phone number is valid or possible if the number have all required digits to be valid for this purpose there are several options to tackle the problem like regular expressions for example to validate E.164 format, library like the [Google libphonenumber](http://Google libphonenumber) and API like the Twillio Lookup for something more complete.
for this post i created a small app for test a demo purpose using the [python port of the Google library](https://github.com/daviddrysdale/python- phonenumbers)
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