Microsoft Cortana
Microsoft Lumia Denim to Lumia smartphones Microsoft

Microsoft's Lumia Denim update which comprises the personal digital assistant (PDA) Cortana will be released to more smartphones in a phased manner across the UK and US.

A number of Lumia handsets in the US are yet to receive the Denim update, even as six months have passed since its launch.

The reason for the slow roll-out in the US has been attributed to wireless carriers that operate within the country. Testing and final verification procedures undertaken by carriers are generally time consuming and more often delay the roll-out of major software updates.

Below is a list of Lumia devices that are eligible to receive the Denim update in the US and UK.

Lumia handsets that are eligible for Denim update in US

Lumia 635 (Country variant, Sprint), Lumia 822 (Verizon), Lumia 830 (country variant) Lumia 925 (T-Mobile), Lumia 928 (Verizon), Lumia Icon (Verizon), Lumia 1020 (country variant, AT&T), Lumia 1520 (AT&T).

Lumia handsets eligible for Denim update in UK

Lumia 435 (EE), Lumia 520 (country variant, EE, O2, 3 UK, Vodafone), Lumia 530 (country variant, EE, O2, Tesco Mobile, Vodafone), Lumia 535 (country variant, 3 UK, O2, tesco Mobile, Vodafone), Lumia 620 (country variant, O2, 3 UK, Virgin, Vodafone), Lumia 625 (country variant, EE, O2, Virgin, Vodafone), Lumia 630 (country variant, EE,O2, Vodafone, Tesco Mobile), Lumia 635 (country variant, 3UK, EE, O2, Tesco Mobile, Vodafone), Lumia 720 (country variant, O2), Lumia 735 (country variant, EE, O2, Vodafone, tesco Mobile), Lumia 820 (country variant, EE, O2, Vodafone) Lumia 830 (country variant, EE, Vodafone), Lumia 920 ( country variant, 3 UK, EE, O2, Vodafone), Lumia 925 (country variant, EE, 3 UK, O2, Vodafone), Lumia 930 (country variant, Vodafone, EE, O2), Lumia 1020 (country variant, EE, 3 UK, O2, Vodafone), Lumia 1320 (country variant, EE, Virgin Mobile), Lumia 1520 (country variant, O2, Vodafone).