libphoneNumber Library is used to validate the phone number and it is a google's library mostly used by google products and Whatsapp. phone number validation is important for app so that you can get valid number from your users. Any verification code, messages that you want to send them will have less chances of being missed. - See more at: http://findnerd.com/list/view/Phone-number-validation-using-libPhoneNumber-Library/8166/#sthash.E6gIewFn.dpuf
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