iPhone 3G Replacement?

Hey all,





I am curious to know if someone can tell me what would constitute an in-warranty iPhone 3G replacement at the apple store?? I have had issues with my iphone for several months, but havent gone to the Apple Store to complain yet (hoping software would fix it)





Here are the main problems:





i) Dropped calls (less but still persist in 2.2)


ii) Call Failed Msg (comes up sporadically when i try to dial out)


iii) Weird noises while on call and receiving data


iv) NO SIM Msg (comes up randomly on the screen and I have to pull the sim out and put it back to get the phone working)


v) Work emails/calendar fail to sync randomly.





I have never unlocked my phone or did any mods to it.





I am planning to make an appointment at the Apple Store this week, but would appreciate any advice/comments from people who have already tried getting replacements from Apple.





P.S. I am in Toronto, Canada. But as far as i know with ATT (USA) and Rogers/Fido (Canada), you have to go to the Apple store for service.