Tutela is an independent crowdsourced data company with a global panel of over 300 million smartphone users, gathering insight on mobile experience and infrastructure. Tutela collects crowdsourced mobile network data via SDKs embedded in third-party apps, and says data collection only happens if you grant the app's permissions. The privacy page links to an opt-out page ("Click here to discover how to opt out?" / "Opt out (Do Not Sell My Info)"), but the actual destination URL isn't shown in the text, so start from the privacy page; a phone number, +1 (855) 6-TUTELA, is also listed. Because collection is tied to individual apps, you may need to revoke permissions or uninstall apps that include their SDK.