|I'm guessing its a verizon phone...|
If so you can take it to verizon and they can clear text messages.
However even if you have an sd card many times with this brand apps are stored on the phones memory, even the ones you don't want
From the main screen, select Media Center.
Select the Options menu (inverted arrow in the upper-right corner).
Select Manage Apps.
Select an application.
also when you get your phone up and running, you should see if your browser cashe is full, this is often stored on the residual phone memory.