Shield: Caller ID Spam Block is a free Android program developed by Suomen Telemarkkinointiliitto Ry in the Utilities & Tools category. It is an effective solution to protect your phone from spam calls and messages. Shield uses a comprehensive registry of phone numbers and email addresses reported over the years to identify and automatically block unknown or unwanted spammers. It also identifies known telemarketers and scammers and blocks them for you.

With Shield, you can always know who is calling, even before answering. The program notifies you of malicious text messages and blocks email spam, protecting your personal and business email from junk and malware. The premium subscription enables automatic number search in caller ID, unlimited call and spam blocking, as well as notifications warning you of harmful text messages.

Shield’s advanced filters also prevent unwanted callers. You can manually search for an unknown caller's name by the number or a number by the name of a person or a company. The premium subscription includes ten such number searches per year, and you can purchase additional number lookups in the app. Shield is a powerful tool to fight new telemarketers, annoying spammers, and malicious scammers, keeping you safe. Shield does not sell or share data with any third-party application or organization.