Good morning @Dreamer, I've just replied to your Private Message - I'll need a few more details and then I'll happily get someone to look into this for you 
Thanks @Anonymous &@Cleoriff for the mentions, and everyone else for all the advice!
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The phone unlocked at some point yesterday - tried a SIM swap yesterday evening and it was working
@DreamerGood news. Pleased to hear it's now working 
Really happy to hear the good news, @Dreamer 
→ Access for You: Registration - Find out how to register for our Access for You service.
→ Want to chat with other fellow-minded members? Head to our Off-topic section for some interesting chit-chat.
→ Check out our Priority board for tickets & offers updates, and to discuss all things Priority-related!
→ Welcome to O2! - New to O2? Find out all you need to know to get started!
If you'd like to take part, why not register?
