phone banging
Quite often is mistakened for phone "sex" but in actuality, it is just simply conversing on the telephone. However, it is more appropiately used with the opposite sex. boyfriend/girlfriend type of deal, or vice versa.
"Me and my girl were phone banging until midnight before she got sleepy and went to bed."
Phone-bang
Phone-bang describes a person who is talking or texting on their cell phones excessively.
Randi was phone-banging all night at the Parlor.