A new phone number number harvester is being advertised these days on the web. The tool does pretty much what an e-mail address crawler can do; scrape the web a page at a time in search for phone numbers, owner`s name and mobile carrier. The number digger can then be aggregated with the service of an SMS gateway for sending messages, from commercial offerings to borderline-destructive attacks exploiting USSD bugs or even for delivering malicious links to smartphone users.”]
Source: https://www.bitdefender.com/blog/hotforsecurity/phone-number-grabber-blows-new-life-in-sms-spammers/