Why your mobile number is in sales databases, and how to get it out
StopBrokers research · Updated October 6, 2026 · 4 min read
Contact databases sell work emails, direct dials and often personal mobile numbers to sales and recruiting teams. You can opt out of each one, but you need a separate request per database. ZoomInfo's privacy policy, for example, lists "Phone number, including general or direct business numbers, faxes, and/or mobile numbers" among the data it collects.
Where the numbers come from
The large contact databases describe three sources in their own privacy policies:
- Contributor networks: data shared by their own users. ZoomInfo says its Community Edition "may access and collect certain Business Information stored in the user's email application," including "information from email signature lines like name, email address, phone numbers, job title." Apollo says "Information that Customers or Authorized Users submit through the Services may be incorporated into the Contributor Database and made available to other Customers." RocketReach customers can share network data by "connecting their cloud email account (e.g., Google or Microsoft)."
- Data partners: ZoomInfo "may license or otherwise obtain personal information from third-party sources such as our service providers and partners"; RocketReach names "people directories, data brokers, corporate information directories"; Apollo names "vetted third-party data providers."
- Public pages: ZoomInfo's "search technology scans the web and gathers publicly available information," and ContactOut says it crawls "publicly available email addresses and phone numbers, such as those that are accessible from websites and social media."
That is why a number you only put in an email signature can end up in a database you have never heard of.
Why it matters
Your mobile number next to your name, title and employer is exactly what a caller needs to sound credible. It makes cold calls more frequent and impersonation easier, for you and your colleagues.
How to opt out
The large databases all describe a removal process:
- ZoomInfo (its privacy policy names Datanyze LLC as a subsidiary)
- Apollo
- RocketReach
- ContactOut
- People Data Labs, a supplier whose datasets reach other tools through APIs and data licence feeds
ZoomInfo takes removal requests through its Trust Center; Apollo at apollo.io/privacy-policy/remove or by email to privacy@apollo.io; RocketReach at rocketreach.co/remove-profile; ContactOut by email; People Data Labs through its opt-out form, after which it says "we will no longer sell your personal information." Apollo and RocketReach both say they may ask you to verify your identity first.
Keep it from coming back
Contributor networks keep adding data, so check again every few months. Apollo says it keeps the minimum information in a suppression list "to honor the request and prevent your information from being re-added to the Contributor Database"; ask the others whether they do the same. Removing yourself at a supplier such as People Data Labs also matters, because its datasets are licensed onward to other companies.
More on removing your data
- How to remove your address from the internet
- How to remove your information from the internet: the order that works
- How to remove yourself from people-search sites
Sources
- ZoomInfo privacy policy: collects 'Phone number, including general or direct business numbers, faxes, and/or mobile numbers'; Community Edition 'may access and collect certain Business Information stored in the user's email application', including 'information from email signature lines like name, email address, phone numbers, job title'; 'Our search technology scans the web and gathers publicly available information'; 'may license or otherwise obtain personal information from third-party sources such as our service providers and partners'; removal via the Trust Center; names 'its subsidiary, Datanyze LLC'.
- Apollo privacy policy: contact data 'from third parties and public sources' including 'vetted third-party data providers'; 'Information that Customers or Authorized Users submit through the Services may be incorporated into the Contributor Database and made available to other Customers'; removal at apollo.io/privacy-policy/remove or privacy@apollo.io; 'We may verify certain requests as necessary to confirm your identity'; keeps a suppression list 'to prevent your information from being re-added to the Contributor Database'.
- RocketReach privacy policy: 'Our search technology scans the web and collects publicly available information from third party websites'; obtains data 'from third parties such as people directories, data brokers, corporate information directories'; customers can share network data by 'connecting their cloud email account (e.g., Google or Microsoft)'; holds 'phone'; removal at rocketreach.co/remove-profile; 'may require you to verify your identity'.
- ContactOut privacy page: 'We only crawl and index publicly available email addresses and phone numbers, such as those that are accessible from websites and social media'; 'You may at any time request the removal of your personal information from our database.'
- People Data Labs homepage: person, company and job posting datasets delivered through APIs, data license feeds and platform integrations.
- People Data Labs opt-out form: 'Once you submit this form, we will no longer sell your personal information.'
Sources re-opened and quoted statements compared by an automated review on October 9, 2026 (every listed source re-opened by a review agent and each number, date and quote compared; unconfirmed statements removed). Not yet re-tested by a person. Drafted with AI assistance from the sources above. How we work.
Frequently asked questions
How did a contact database get my mobile number?
The databases describe three sources in their privacy policies: data their own users share (ZoomInfo's Community Edition reads 'information from email signature lines like name, email address, phone numbers'; Apollo adds what customers submit to its 'Contributor Database'), third-party data providers, and publicly available web pages.
Will opting out of one contact database remove me from the others?
No. Each database needs its own request. Suppliers such as People Data Labs license their datasets to other companies, so a removal at the supplier matters too.