Wives can now track every text, every call and every move their disloyal spouses make, thanks to a new smartphone software.
The software can track its users, record their calls, copy their emails, read their text messages, once it is loaded onto their phones.
And the best thing is that the victim wouldn't know his phone had been comprehensively hacked.
"When you begin to notice signs of a cheating spouse, the best way to catch that cheat is to spy on his or her cell phone using spy software," Sky News quoted one of the developers of mobile phone spyware as saying.
"Such software is required because the cell phone has become the modern day keeper of secrets and its uses are as versatile and diverse as their makes and models," the developer stated.
Jason Hart, a cyber security expert with Cryptocard, explained how easy it is to turn a mobile phone into a pocket spy.
It starts with a little "social engineering".
By hacking the phone of someone the victim might trust, and learning something about them from reading their Tweets and Facebook page, the attacker will send a personalised email from a known account.
The user opens an email and a document, a picture, letter or pdf file.
A programme can be embedded in the attached document which takes the hacked user's phone off to a secret website site which covertly downloads spying software onto the smartphone.
Shortened weblinks are also a risk.
"Using Facebook and Twitter (and) getting an individual to click on a shortened link would actually take them to a website and automatically install malware," said Hart.
"There is no way that a victim would know his phone had been comprehensively hacked," he noted.