The Tel URI security block is a quick fix to fix the security of the Tel URI. It's a solution to a problem that's been hanging around for a long time and that everyone must have known about.

The problem with the Tel URI is that it's very easy for an attacker to create an iFrame that's loaded with a malicious code. The result is that the user gets a malicious code that can be used to reset the phone, block the SIM card, or even block the internet.

This app is a solution to that problem.