Lawyers say that partners in breakups sometimes install spyware on computers or phones.

These are apps that are available for a subscription fee, say $16.99 a month. Once installed, people can see every incoming and outgoing message from the target's phone, Web searches, even keystrokes — the letters someone is typing, say, when they log into a bank account. And spyware takes just minutes to install.

The legality of tracking technology is messy. Parents are allowed to put spyware on a child's phone or a home computer, for example. But, experts say, putting it on a spouse's smartphone without consent is generally illegal.

Lawyers say they can't prevent their clients from using digital spying. Some are willing to accept such evidence if legally obtained and will even present it in court to help their client's case. Other lawyers don't want to get near it.

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