addressing, communicating (with), contacting, getting, reaching

getting through (to)acquainting, advising, apprising, briefing, clueing(or cluing), enlightening, familiarizing, filling in, informing, instructing, notifying, telling, wising (up)buzzing, calling, phoning, ringing (up)(chiefly British), telephoningkeeping up (with)

getting hold of, touching base (with)