Recently EE of UK has launched sub model of Huawei E5878 mobile WiFi MiFi router, dubbed as Huawei Kite E5878s-32.
You may get variant models locked to a particular network in other reasons with Vodafone, Orange, Tenelor, or Telstra also. After unlocking the device you can use it worldwide in any countries including Australia, USA, Asia, and Middle East.
You find unlocking guide of Huawei E5878s-32 in details here. I have already unlocked one E5878s-32 router which was locked to UK EE network. Unlock code charge is only 6 USD, interested people can pay through Paypal button of this website, while paying mention model with IMEI in the transaction. Correct code will be delivered via email.