Huawei EC226 & Snow Leopard
If Snow Leopard can no longer see your Huawei device, you will no doubt need to visit this page – http://www.huaweidevice.com/resource/mini/200910149695/testmobile1014/index.html.
It seemed a little confusing at first, installing the software, but what you need to do is run the installer and when it asks for the application to install, you need to point it towards the mobile partner application on the internal drive.
There is also another method which involves removing some Kext files and then re-installing them, but this way is far easier.
Once done, there are three Huawei interfaces in the network preferences.