Chinese telecommunications company Huawei has announced a number of ‘smart devices’ at Mobile World Congress today. There’s a new slim smartphone – the Huawei IDEOS X3 – and a new tablet, along with a data card and a wireless modem.

The Android-powered Huawei IDEOS X3 will launch in the spring. It has a 3.2-inch touchscreen and a 3.2-megapixel camera. It’s expected to run Android 2.3 in most markets.

Chinese telecommunications manufacturer ZTE has announced a flagship Android smartphone with a 4.3-inch display screen.

The ZTE Skate uses the Android 2.3 operating system with an 800MHz processor. It also includes a 5-megapixel Bluetooth, A-GPS, hardware compass, and G-sensor.

LG announced two 3D-capable devices at Mobile World Congress this morning. The LG Optimus 3D, which can record and play 3D video, was widely expected – although the appearance of a tablet with similar 3D cameras was more of a surprise.

Both devices are equipped with twin 5-megapixel cameras on the back… and both have dual-core processors inside.

Samsung launched its Galaxy S II smartphone in Barcelona on Sunday night, just a few hours before the official opening of Mobile World Congress.

It’ll be equipped with a Dual Core Processor and a 4.3-inch super AMOLED screen, yet will be less than 8.5mm deep. An 8 megapixel camera and full 1080p HD recording help to complete the spec.

ViewSonic Europe has a double announcement today. It’s launching a dual-SIM Android smartphone and a dual-boot Android/Windows tablet. Both will be previewed next week at Mobile World Congress.

The ViewSonic V350 smartphone runs the Android 2.2 Froyo operating system. As a ‘dual-SIM’ device it’s able to offer two connections on different networks at the same time. Specifications include a 3.5-inch HVGA capacitive touch screen, 5-megapixel autofocus camera, microSD memory expansion, WiFi, Bluetooth and GPS.