Alas, useless and unreliable.
Last Monday I was called continuously (every minute!) by an anonymous calling robot.
Therefore I installed this app. The free version turned out to be of no use, so quickly to the paid version.
However, that also did not show the true number of the anonymous caller.
Politely asked for help, twice. No response except for a standard message, promising a reply within 48 hrs.
Creating an account on their site didn't work either.
Conclusion: completely worthless app + crapy customer service.
Subscription immediately canceled and credit card company requested to block the payment.
This is less than € 5, but it is based on a precious principle: just treat your customers properly…