You can't. If you really want to text without WiFi though I suggest buying an iPhone. That's exactly why Apple came up with an iPhone anyways.
For texting with WiFi though i suggest using an app called textfree+Vm, I use it all the time and besides getting a limit with calling you can text as much as you want free as long as a wireless connection is available.
Yes you can text on the ipod touch 4. You need wifi and you have to download the app "Textnow" and you can text
You can get an app that does but you need wifi. Otherwise no.
Get the free app Text Plus. You would need wifi though.
Yes. U can get an app for texting for free but u need wifi for any texting app.
text+
Yes it can all you need is any texting app I have text now but you need wifi.
Nope
Yes you need WiFi
No...you don't need wifi for the American idol app for iPhone.
yes you can but you need wifi and an app from iTunes some apps are free and others are not.
Yes you do need wifi
yes, but you must have wifi.