IPhone 4 SIM Compatability/Antenna Problems

Basically, Im buying an iPhone 4 and wanting to use same contract on a Micro Sim, will everything work ok on iPhone 4?
Specificly, I currently have an iPhone 3GS on O2 with Unlimited Data, Unlimited Texts and 600 minutes. It is an iPhone Tarrif but i was wondering if i got O2 to send me a Micro SIM still on my same Tarrif (as i have about a year left on my contract) would everything still work on the iPhone 4 when i buy one? i tried to talk to O2 about it and they said it will work but i might not be able to use certain features (which was very unspecific and not very helpful). Anybody else tried to do the same thing?
nybody also experienced antenna problems on O2 in UK?

Since you're running a seed version of iOS, you need to take this up in the forums to which you have access as an Apple developer program members. We can't help with issues involving iOS 5 in these public forums.
Regards.

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