As
@Glenntech said yesterday:
"@DaVader So that's a UK EE supplied phone
Could be you will need an EE sim card to get any software updates.
Should still get updates and EE has updated their phones.
Maybe get a cheap EE pay as you go sim card from a news agents and try it
Can try connecting to a computer and using smartswitch on the computer to check for available updates as well"
To reference 'Glenntech' above, you'll likely need an EE Pay As You Go sim card.