Is there a way to print text messages using an iphone 4s running ios 7

Have an Airprint enabled printer?

http://support.apple.com/kb/HT4356

That's the easiest way.

For my client, yes but how since there's no print option for iMessages/texts/SMSes? Other apps like e-mails are fine to the printer.

You can take a screenshot and then forward to your email address or AirPrint the screenshot. But this format of screenshot is not txt. If you want txt format, you need to use iPhone Transfer to print text messages from iPhone. You can also email the SMS to your own email account.

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There are two methods to print text messages from iPhone. If you just need to print a few, you can screenshot the text messages by pressing the Sleep/Wake button and Home button simultaneously, and find it in Photos app, then you can print. If you lots of messages needed to print, you can use third-party apps to export them to PC at a time, then print them as usual.

do you know any of the apps? I have searched and found only one and that one would not work after it was emailed to me. It would not download