In a Wednesday announcement, second-biggest US wireless carrier AT&T said that it is launching a new smartphone app to give its customers a new way to block spam calls.

The new smartphone app released by AT&T is dubbed ‘Call Protect’; and it is free for Apple iPhones as well as Android-powered handsets.

According to AT&T spokeswoman Emily Edmonds, the ‘Call Protect’ app can be downloaded by anyone, but it works only with those handsets which boast compatibility AT&T’s free HD Voice service. At present, there are a total of 22 such handsets, including the last two iPhone generations and the Samsung Galaxy S handsets.

The new Call Protect smartphone app has the capability to automatically block robocalls and identify other suspicious spam calls for users of HD Voice-compatible handsets.

Revealing that Call Protect’s companion mobile app for iPhone and Android handsets allows AT&T customers to setup temporary call blocking, AT&T said that customers are sent notifications about what has been auto-blocked. AT&T also said that the Call Protect app is capable of blocking spam calls at the network-level before such calls reach the handsets of the customers.