Can I use my AT&T iphone sim in a O2 iphone or vice versa?

As the headline says can i use a AT&T iphone sim in an O2 iphone, and also vice versa. I travel extensivley between the UK and america and really only want to use one phone. Can any one help? No turbo sim or yellow snow suggestions please! Thanks
mark

No, US phones are locked to AT&T while UK phones are locked to O2.

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Can I use my AT&T iphone sim in a O2 iphone or vice versa?

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