Text messages don't actually get deleted

To all apple iPhone owners! Beware !! Apple iOS software stores every text message ever made on your phone.
You may think you've deleted them but there still there. I found out myself when I was using spotlight search to find something and noticed that some text conversations I made months ago were showing up!
These text messages were deleted a long time ago or so I thought.
When I contacted apple customer support, they told me the only way to permanent remove all text messages and ooh yes also emails , is to do a master reset, or restore to factory setting on iTunes. This intern removes all data from your phone. The downside to this is all your contacts , apps, and settings are erased. You also can't backup from previous because then it puts it back in ur phone. I know I have done it.