Denise:
If your asking about the ( Limit on Text messages ) the Normal Limit for messages is 200 but that can be changed to a Different range of Limit) Go to your message Widget tap it.. It will bring up the main message Screen) To then go to your messages Settings Tap the setting button next to the Home button it will them pop up on the screen Message Settings tap it followed by >> the Set Message Limit indicator Tap on the top set the Limit at a Lower Range Tap the Bottom to set a Higher Range..
You can Delete message if you'd like but if you choose to go that route and then should want them back it will take a Certain app to Retrieve them just be Aware.. In these Photos I provided it shows the Messages Settings and the Message Limit Indicator.. 
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