Screen Lock

Hi all ,
just want to ask if there is a way to lock phone not hold , i mean like in nokia we pree Menu + star so key pad is locked .
in F480 i can only hold the phone , is ther a way to hold the phone with password "Phone lock code".

Thanks

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When not within an active call, the Hold Button blocks touchscreen input.

ok , but for security i want to make a real lock, i mean after pressing hold button to open phone i want it to ask for a security Number
Thanks.