Robo Shield Spam Call Blocker is a free call blocking app developed by AnchorFree Inc. for iPhone. This app is designed to help users block unwanted calls, such as spam, scam, political, and telemarketers. It also provides reverse number lookup and scam protection and identification features. Robo Shield's database is updated every six minutes to ensure the most accurate information and the best call protection.

Robo Shield offers a monthly subscription of $2.99/month that includes premium access to Hotspot Shield VPN. The subscription automatically renews 24 hours before expiration and payment is charged to the iTunes account used for the purchase. Cancelling the subscription must be done 24 hours before the subscription period expires to avoid being charged for another month. AnchorFree Inc. is a top mobile security company and has been trusted by over 650 million users worldwide.