Deleting all SMS at once?

I can't figure out a way to delete all of the SMS messages at once, if this phone doesnt have a basic feature like that, I will sell my phone to anybody on this website or ebay for less then $100 dollars, I don't care how much money I'm losing but this phone seems to be a huge piece of crap.
If you know how to delete all of the SMS's at once, like any other $10 phone, please let me know

Thanks

Naor