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As opposed to an active plan have you actual credit on your sim? And if so how much?
Cookie is spot on, as you would need to send an SMS to the UK in order to activate the iMessage service, you would need to have enough credit on your account before you can send this international text. However, if you private message (via the link in my signature) over the below info, I can have €0.15 credit added to your account for you.
Date of birth:
Link to your thread or post: