How to delete spotsearch entirely from iphone?

I just notice that on spotsearch on iphone, you can view messages that you get and i'm a private person that does like people snooping around my phone, for particular reason you can't delete this from iphone. I mean it stays there for ever and can't be deleted nomatter what, of course a person can unpresss the messages through setting options but still if you let a person borrow your phone they can go there and undo the message and cam view your older message and people you've text. In my part apple has to some how deleted this spotsearch option complety, its useless and i don't used it at all. Either they find a way to nake sure people can block users or deleted the older text numbers and messages. Apple iphone sucks! Please can anyone tell me of a way to deleted the entire spotsearch i don't want to cover it in settings by unpressing it, want deleted all together.

Spotlight search only searches what is on the phone (with the exception of searching the internet or your email). If you have deleted material it will not show up in the search. You can go to settings/general/spotlight search and change what shows up in spotlight search as well as the order the results appear in.