addresses, communicates (with), contacts, gets, reaches
gets through (to)acquaints, advises, apprises, briefs, clues, enlightens, familiarizes, fills in, informs, instructs, notifies, tells, wises (up)buzzes, calls, phones, rings (up)(chiefly British), telephoneskeeps up (with)
gets in touch with(or keeps in touch with), touches base (with)