The best way to address the security and privacy concerns caused by a malware infection on a smartphone is to uninstall all recently installed applications and schedule an antivirus scan. Uninstalling the applications that may have introduced the malware can help remove the source of infection and prevent further damage.
Scheduling an antivirus scan can help detect and remove any remaining traces of malware and restore the device's functionality.
References: CompTIA A+Core 2 (220-1102) Certification Study Guide, Chapter 5: Mobile Devices, Section
5.3: Mobile Device Security1