In mobile computing, snoopware is malware that is capable of monitoring activity on a smartphone. Snoopware can run in stealth mode to monitor phone calls, text messages, voicemail and e-mail or it can be used to turn on the phone's camera and microphone without the user's knowledge. Snoopware is almost always delivered to a smartphone by a text message or multi-media message. Users are cautioned against opening messages from people they do not know