communicate(example provided by ART Vancouver:: I work in a call centre, so since I can't answer my phone, e-mail is the best way to communicate for me.)
keep up with(We’ve kept up with each other ever since we left school; Ann and I haven’t seen each other since college, but we keep up through our annual Christmas letters Taras)
be in bed with(to work with a person or organization, or to be involved with them, in a way that causes other people not to trust you: " The newspaper editor is obviously in bed with the president. CALD Alexander Demidov)