You can block people from calling you when using LG Cosmo. Turn your phone on and locate the Settings menu. In "Settings," scroll to "Call" select "OK" to enter the menu. Scroll down to "Call Reject" and select this option. Select "Call Reject List" on the next menu. Enter the ten-digit number of the person that you wish to block and confirm your selection. Read more from http://www.ehow.com/how_5002451_block-numbers-lg-phone.html#ixzz1tHWNl55K.