Talk:China/@comment-28570249-20160527190156/@comment-28154188-20160527192856

You get both a China and Hong Kong number.

I don't know if you can roam in Europe. http://www.cugstore.com/hk_en/prepaid-sim-card/cross-border-king.html doesn't list any European tariffs, but it still might be possible.

I punched out the nanoSIM card, put it in my iPhone 6S when I landed in Beijing and was able to make calls and use data within a minute. There doesn't seem to be any activation required.