Texts messages coming through slow on Iphone 5?

I got the Iphone 5 for Christmas the other day and as much as I'm happy with it etc I've just noticed that all my texts seem to be coming through about 10 minutes late, or even later. I'm on O2 and it has nothing to do with the network because my friend is on O2 her texts are fine, I text her quite a lot and I always get her texts coming through a couple of minutes later. Is their any idea why this might be?

I'm not in the UK in in the us iPhone 5 is a us phone just imported to uk 3g not LTE that's 9 times faster its something you have to live with

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