PEK T3 Exit B tourist outlet +86 13121 195558 [6am ~ 10pm]

7D Rmb 100 tourist SIM providing 30GB + 100min outgoing
15D R 150
30D R 250

Takes 5 minutes to set up, with smrz

On Day 7 (early morning) this numer would 失效. After not before that you can visit any Unicom office except T3ExitB to convert it to long-term. Cheapest 套餐 is Rmb8/M.

Long-term SIM is doable at airport for anyone 18 or above.