on 18-04-2020 09:27
on 18-04-2020 09:31
It's the phone which is locked to Vodaphone.
O2's guide on unlocking is here
Guide: Unlocking an O2 phone to use a different SIM card
Veritas Numquam Perit
on 18-04-2020 09:47
on 18-04-2020 09:47
Only Vodafone can can unlock it, not O2 but if they won't you can usually get unlock codes cheaply off eBay.