How to spy on spouses’ text messages?

The monitoring market offered an effective way to spy on spouses’ text messages – SMS tracker app. This also may be spyware, spy application or parental control app. All of them work by the same principle – they need to be installed on the spouse’s phone. It requires one-time physical access to it. Further on, there’s no need to take a handset to spy on the spouse’s text message. It’s enough to log in to an account given to the app’s user during the purchase and read text messages from there.