1. Saying things by mobile phone that (a) appeal to or stimulate sexual desire, (b) that are lascivious, or (c) that are Lustful; bawdy.
2. Using a cell phone (a) in a vulgar manner, or (b) in a sexually stimulating way (whether for oneself or others).
3. Having compartmentalized lascivious thoughts.
4. Being able to tap into and/or express your innermost salacious feelings wherever you are.
That fellow is making lewd phone calls to his girlfriend at all hours of the day by mobile phone, demonstrating exceedingly cellacious behavior.