I. INTRODUCTION  
II. SMARTPHONE OPERATING SYSTEMS  
A. Definition  
B. Smartphone OS Features  
C. Comparison of the Smartphone Operating Systems  
III. MALICIOUS ATTACKS  
A. Malicious Applications  
B. Attacks or Threats  
C. Software Vulnerabilities  
IV. MOST WANTED MOBILE MALWARE FAMILIES  
V. SECURITY SOLUTIONS FOR SMARTPHONES  
A. Malware Detection Techniques  
B. Countermeasures against Malware  
VI. SUGGESTIONS FOR THE FUTURE WORKS  
VII. CONCLUSION