Does anyone have any experience with this? :

http://www.penn-olson.com/2011/09/28/china-unicom-film/
http://shanghaiist.com/2011/09/15/how_t ... etwork.php

It's a sticker you can put on a China Mobile Sim Card to get access to China Unicom's 3G network.

So you can have Unicom's 3G Data with China Mobile's telephone service. All this without having to port your China mobile number or getting a new Unicom number.

It's on Taobao at item*taobao*com/item.htm?id=13064137295

Is this easy/convenient/reliable to use?

Thanks!