My lock button on my iPhone broke?

My lock button on my phone broke and I'm gunna get it fixed but i know there's a setting that can lock it wheere there's like a circle on your screen and you press it and go to devices and lock it or something. How do i turn that setting on?

You can have it fixed/replaced for around $30-40.
I send a 3G thru the mail to this online company to have it repaired so I don't have to pay the $200 out of warranty fee that Apple charges.
They fixed and mailed it out same day.
I hate to sound like an informercial but they were top notch.
If you want their site let me know.

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