How to use China Unicom's 3G network while staying with China Mobile

Gang Lu of TechNode points us to a unique little innovation developed by China Unicom that he says the provider is selling "under the table". The device basically allows China Mobile users to use China Unicom's 3G network which makes sense since China Mobile has better mobile coverage while Unicom remains the better 3G provider. Here's how it works:

Basically, you just attach that film sticker (card) on your China Mobile sim card, then insert it back to your phone. What happens is that you can still make/receive the call, send/receive sms message etc using China Mobile service, but in the meanwhile, you can also surf the internet using China Unicom’s 3G network. As we said before, it is pre-paid data card which means you can just do top-up when the credits run out. It’s so impressive, and I bet China Mobile will get pissed off by this innovative product.