Even still, it might not be enough. Dan Hastings, a security researcher from NCC Group, told TechCrunch that several popular apps designed to block robocalls also run afoul of privacy policies and expectations. Many of them collect and send user data to third-party firms, usually to the financial benefit of the developer, according to Hastings.
TrapCall is not the only app to be concerned about. Hastings says both Truecaller and Hiya upload a user's device data, including the device type, model, software version, and other information, before a user has a chance to accept the app's privacy policies. While that seems rather tame in the grand scheme of things, that type of behavior runs afoul of Apple's polices.
"Without having a technical background, most end users aren’t able to evaluate what data is actually being collected and sent to third parties," Hastings said. "Privacy policies are the only way that a non-technical user can evaluate what data is collected about them while using an app."
Hastings sent emails to the developers of these apps to let them know about the apparent privacy violations, and to TrapCall's credit, the developers updated the app's privacy polices, though only after Apple got involved.
Likewise, a spokesperson for Truecaller said the developers have since implemented a fix to be in compliance with Apple's app guidelines. Hiya, meanwhile, said it does send certain data to third parties, but says it does not collect personal information.