Default [HELP] Verizon G2 on China Unicom


I am visiting China with my VS980 (Verizon G2). I purchased a China Unicom 3G SIM, and cannot figure out how to get data (store employees useless). I imagine it has to do with either the Mobile network settings, or the APN. I have the it set to "No Data Roaming", then edited the APN per China Unicom's instructions, then tried "finding network operators". Nothing has worked. The SIM doesn't even prompt me to reboot etc when I put it in. Please help!!