My first point of action after arriving in China was getting a SIM card for my phone. A friend recommended the company, China Unicom, to me. 3G data and a modest phone plan for my iPhone for 150 RMB. Super easy and got it at the airport. Look for the machines by the bathroom after you go through customs. An employee will be there that speaks English and they’ll walk you through the plans. I think it’s totally worth it just to get around with, since I have found no free wifi around Beijing.