How much will I be charged for iMessage and data use?

When you activate iMessage, an international SMS will be sent to Apple at +447786205094. There's no charge to you for sending this and it will appear in your usage history.

You'll incur a data charge each time you send an iMessage.

If you don't have a data allowance or sufficient PAYG credit, but you have an SMS allowance on your plan, you will be charged at the SMS rate instead.

You'll also be charged for an SMS if the recipient is unable to receive iMessages.

In your iPhone settings, you can configure your device to "send as SMS" automatically when iMessage is unavailable and normal SMS charges (if applicable) will apply.