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Can you browse the net though??...if you can then its usually the app that can get stuck...sometimes ive had an app get stuck so ive stopped it and then tried re-downloading it.
If you cant browse the net then its a network problem so give Voda a ring and see what they say.
Thanks for your help, seems to have cleared now though!! . seems it may have been a network problem as about a dozen emails arrived about the same time.