Nokia has announced two new affordable Lumia devices at the Mobile World Congress (MWC) trade show, and also unveiled its cheapest ever phone, the Nokia 105.

The Nokia Lumia 720 and Lumia 520 join the already extensive Lumia range of phones.

With an estimated starting price of €139 (£91), the Lumia 520 is the most affordable Windows Phone 8 smartphone ever offered by Nokia.

The 520 features a 4-inch touchscreen and a five-megapixel autofocus camera on the rear, with the same lens features as the top end Lumia 920.

Alongside around 130,000 apps from the Windows Phone 8 Store, users also get access to various Nokia services, including Nokia Music for free music streaming and the Nokia HERE location services. The 8GB internal memory can be expanded up to 64GB via microSD card.

The Lumia 720 has a larger 4.3-inch display with IPS and ClearBlack. The 6.7MP camera on the rear has a large f/1.9 aperture and Carl Zeiss optics for bright pictures in day or night. The phone also has a wide-angle front-facing camera and a fairly new feature to mobile phones: wireless charging (with an accessory).

The Nokia Lumia 720 comes in five colours, with an estimated starting price of €249. The Lumia 520 also comes in five different colours and has an estimated price of €139.

Priced at just €15, the Nokia 105 is pitched at first-time phone buyers. They get a colour screen offering all the core functionality of a phone, including internet and email, along with an FM radio, alarm and speaking clock, and a flash light.

The phone is dust and splash proof, and the battery is claimed to give 12.5 hours of talk time and up to 35 days of standby time, which Nokia feels makes it "ideal for people seeking a back-up device".

The Nokia 105 will be available in black and cyan colours for a recommended price of just €15, making it Nokia's most affordable ever phone.

Written and presented by Adam Justice