If you're on a call and go to the home screen, then reopen the call, the mute and speakerphone icons no longer appear toggled. Click the voicemail notification, it doesn't bring you to voicemail. Sometimes when making a call, the notification doesn't open the call screen and I have no way to hang up unless I force quit the app and reopen. Fix the phone features or only block spam and forward the rest to the default phone app that actually works. I'm finding it harder and harder to pay for this.