Hi philippe, here is a list of 4 Best Security Apps you must install on your Samsung Galaxy S IV.
Remote cell phone tracker/locator and malware protection (with USSD blocker).Highly recommended by Android authorities, AV-Test, PCAdvisor, Techworld, and now over 10 million users worldwide.
Get Avast from Google App Market
2. Dr. Web Antivirus Light
Dr.Web anti-virus Light uses the unique algorithm to detect malware. Origins Tracing for Android ,which allows detecting the new virus families using the knowledge database on previous threats. A unique record is created for each malicious program and describes the behavior algorithm of this sample. This provides the efficiency of detecting new modifications of the whole virus family and significantly reduces the size of virus databases.
Get Dr. Web Antivirus Light from Google
3. F-Secure Mobile Security
F-Secure Mobile Security for Android,Windows Mobile, Symbian OS,will protects your mobile devices against malware attacks and monitors incoming and outgoing connections and protects the device from network intrusion attempts.
Get F-Secure Mobile Security
4. AVG Antivirus
AVG Antivirus for smartphones & Tablets detects harmful apps & text messages. AVG Mobilation Antivirus Free for Android is a mobile security solution that helps protect your mobile device from viruses, malware, spyware & online exploitation in real-time. Free, top-rated, real-time antivirus and anti-theft protection for smartphones & Tablets. AVG Antivirus for Android protects you from harmful viruses, malware, spyware and text messages and helps keep your personal data safe.
Get AVG Anitirus from Google Market
Now you can choose anyone antivirus for Samsung Galaxy S4 smartphone