We're in Barcelona for the GSMA Mobile World Congress 2011. Here's our report at the beginning of day three, talking about personal privacy in the mobile age. Contributions come from Qualcomm, Eric Schmidt of Google and the Mobile Marketing Association.

Daniel Joseph Barry of Napatech writes:

Avoiding the dreaded Scissor Effect has become the number 1 priority for mobile carriers. The scissor effect refers to the phenomenon of rising infrastructure costs and flat revenues; an unsustainable situation for any business. The scissor effect has already been witnessed in fixed line networks and now mobile carriers face the same challenge in relation to mobile data services. Is it possible for mobile carriers to grow revenue per user in line with bandwidth usage?

HTC has revealed a number of new products at Mobile World Congress, including two Facebook-focussed handsets. The Android-powered HTC ChaCha and HTC Salsa both feature a dedicated Facebook button for one-touch access to key functions of the Facebook service.

Also expected in Q2 of 2011 is the HTC Flyer tablet. It’s a 7-inch device with a 1.5GHz processor and an aluminium body.

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.

Orange is adding new features to its Android devices. Orange Gestures – developed in-house by the Orange Group Devices business unit - lets users draw gestures on their homescreen to give fast access to applications or services.

The company is also introducing ‘smart’ wallpapers with built-in apps for its  Android-powered Orange Signature smartphones.