SIM card for iphone 4s won't work?

I've put my new o2 SIM card into my new iphone 4s and the iphone says: 'this phone is not currently steup to work with carrier you're attempting to use. Please insert another SIM card from a supported carrier or request that this iphone be unlocked.' i've tried to call carphone warehouse about 6 times now and they won't pick up, and i need to have it ready by tomorrow.

Probably because iPhone's suck, anyways call Apple. They always have the best ideas. Depending on where you got the sim card from, they might not take the sim card or the sim card could be defective. Keep trying to get ahold of where the sim card is from, though. Hopefully you can return it if it isn't supported.

It's because your iPhone is locked to a specific sim. You have to use the appropriate sim it is locked to.

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