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To get this issue resolved faster, share authoritative evidence and sign our CLA if needed and ensure you're using the email associated with the CLA. See more details here: https://github.com/googlei18n/libphonenumber/blob/master/CONTRIBUTING.md#provide-supporting-evidence

Country: Brazil
Example number(s) and/or ranges: 555196910710
For short codes, cost and dialing restrictions:
Where or whom did you get the number(s) from: A registered WhatsApp user who messaged through our platform

Authoritative evidence (e.g.national numbering plan, operator announcement):

Link from demo (http://libphonenumber.appspot.com) showing error:
https://libphonenumber.appspot.com/phonenumberparser?number=%2B555196910710

The number returns false from isValidNumber()