PocketGeiger Types4 and 3 did not work on iOS7 when you use iPhone or iPad series temporally, because iOS7 upgrade software changes the microphone input level on your device.
Now the new Lite-version App supporting iOS7 is available. https://itunes.apple.com/jp/app/pokettogaigalite/id448044891
If you have Pro version App, you can fix the problem by setting threshold=20% on Setting menu.
Now we are creating new Pro-version having this new threshold setting as default.