It keeps asking for the correct sim card. Very weird.
Edit: as of June 2022 personal greeting and name greeting agent working in the UK on EE. First class visual voicemail app. It's the best on Android. I've never had any issues and I've used it with several mobile operators here in the UK. Highly recommended.
Rating this APK is just a waste of time bcz when you install this APK it says no sim card