There are several free applications for Android devices to track text messages. The Phone Tracker app allows a user to monitor up to five devices, as long as he has access to them to install the app.
Another application available on the Google Play Store is SMS Tracker. The drawback with free spy applications available on the Google Play Store is that they are required to fire off a notification on a regular basis to let the user know that he is being monitored. Google privacy rules make this mandatory.
Paid spy software available from WebWatcher and mSpy are not bound by those rules, but they are subject to local or federal legislation.