Whos calling is a free iPhone app developed by Vasiliy Shaydullin. It falls under the category of Utilities & Tools and aims to assist users in identifying spam and scam numbers, as well as blocking unwanted incoming calls.

With Whos calling, users can create a list of spam numbers and choose to either block them or simply identify them. The app also provides the option to check a number in its database for further information.

The main features of Whos calling include its ability to identify and block spam and scam numbers, as well as its user-friendly interface. The app offers a simple and intuitive experience, allowing users to easily manage their incoming calls and protect themselves from unwanted disruptions.