While JoeyC is correct, I am sure you meant to ask how to receive Cell and/or cordless phones on your scanner. The short answer is: You can't, unless the cordless phones are very, very old. Cell phone frequencies have been eliminated from scanners for many, many years.
Since cell phones are now digital and most cordless phones are also digital and/or spread spectrum and/or on gigahertz frequencies beyond the range of most scanners, why bother?