There is a Trend to use Surveillance Software rather then Retaining a Private Investigator - http://spymobi.com/infidelity/%ef%bb%bfthere-is-a-trend-to-use-surveillance-software-rather-then-retaining-a-private-investigator/
Apple denies knowledge of NSA's 'complete' access to iPhone: "...A leaked NSA document, posted by German newspaper Der Speigel, describes the “software implant for the Apple iPhone” that can be used to gather information from the phone: It can turn on the microphone and camera, intercept text messages, creep through a contact list and more..."
Malware called 'Eurograbber' steals 36 million Euros, the malware intercepts two-step authentication text messages sent to customers' phones. Read : http://thehackernews.com/2012/12/malware-called-eurograbber-steals-36.html
For Many People Suspicious of an Affair a Common Method is to Deploy Tracking and Monitoring Technology In Place of Recruiting Detectives - http://spymobi.com/infidelity/%ef%bb%bffor-many-people-suspicious-of-an-affair-a-common-method-is-to-deploy-tracking-and-monitoring-technology-in-place-of-recruiting-detectives/