I'm a little reluctant to weigh in here, because I certainly do not want to sway Nick, not knowing the totality of the situation, but... I have a slightly different take. He should find a way. If I needed to make an important call, I have any of 15 phones within 20 minutes of me. My personal cell, my work cell, my home phone, my office phone, my wife/two daughters/two stepsons... and I haven't even touched other friends and family there, nor have I even mentioned email. Radio silence right out the gate is NOT a good sign.
Look, I get that we're (presumably) not talking about life-and-death issues here, but let's not forget here that we're not talking about "friends" or "partners"; we're talking about someone that we're going to pay good money to to provide a service back on OUR terms. I'm all for making the work experience as fun and rewarding an experience as is reasonable, but not - but NEVER - at the expense of the fundamental nature of the relationship: that person providing a service, at pay, for me or my organization.