Nokia is expected to unveil a series of Windows Phone 8.1-based smartphones at the upcoming Mobile World Congress (MWC). The series will include the Nokia Lumia 1820. According to sources in Taiwan, the Lumia 1820 is likely to come with a Qualcomm Snapdragon 805 processor, 5.2-inch qHD display and 3400mAh battery.

Other models also expected to be highlighted at the event include the Lumia 1520V, a variant of its flagship Lumia 1520. The Windows Phone 8.1-based 1520V will have a smaller 4.45-inch screen and 14-megapixel camera.

Also on display will be the 6-inch Lumia 1525.