Why does iPhone work differently from Android?
On Android, CallReply reads the call log and sends the automatic text from your own number, even with the phone locked. Apple made a different choice: on iPhone, no third-party app can look at past calls or send a text unless you tap Send. This is not a setting you can switch on; it is a limit of the system. We would rather say it plainly: on iPhone, CallReply saves you time on every reply, but it cannot offer the fully automatic sending that Android allows.