how to monitor my kids text messages

There is no ability built into the iPhone that will allow you to monitor the content of text messages on another phone. If you want to monitor the message usage, your mobile service provider should be able to help you. If you want to monitor the content of messages, you will need to look for a third-party service or tool. A quick search yielded the following -- mSpy (http://www.mspy.com/), WebWatcher (http://www.webwatcher.com/). There are others. You need to be very careful with these kinds of services. Some require you to 'jailbreak' the phone. Doing this will void any remaining warranty and Apple will not repair or even inspect a phone that has been jailbroken. See Unauthorized modification of iOS can cause security vulnerabilities, instability, shortened battery life, and other issu….