I do not find a specific for Cell Phone, only Client Phone & Client Work Phone. 

You can find the key words while editing - see image in this a post from almost 5 years ago and my guess if it were 10 years ago it would not look any different. I do no believe keywords have been changed this century. https://accountants.intuit.com/community/lacerte-tax-discussions/discussion/lacerte-letter-codes/00/...