Android only installs an update signed by the same key as the version already on your device. This timeline shows every signing key we've seen for Call Defender - Caller ID. One known signing key across every release we hold.
9.5.3.3.0
Current key1 release · Jul 30, 2026Every key we have ever recorded for Call Defender - Caller ID. New builds are compared against this set; a build signed by none of them is what our badge calls a mismatch.