Yes, 簡訊分類過濾 is free to download, however it contains in-app purchases or subscription offerings.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
簡訊分類過濾 has several in-app purchases/subscriptions, the average in-app price is $90.00.
To get estimated revenue of 簡訊分類過濾 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.