What phone/service for use in the UK, Europe and Australia

[Bossman]

Yes. The phone will be locked to the carrier say tmobile or AT&T. However, both of them will provide the unlock code (if requested) after 90 days of service in good standing. I unlocked 2 phones each from AT&T and Tmobile last year.

You are correct. You will need to unlock the phone to use another carrier's sim in it.

Originally Posted by brainwave1989

Thanks Bylo.

If I get a plan say with T-Mobile will any phone I get with them be locked?
Would this prevent me from using any of the pre-paid GSM cards?

Thanks.