Can I flash or unlock a sprint IPhone 4 to AT&T?

I have a sprint iPhone 4 and I want to use it on AT&T problem is! There's no sim card slot so would I have to flash or unlock it and take it to AT&T to get a plan

Not possible.

Sorry it is not possible.

Two corrections to the very very good answer that is already given:
1. GSM unlock (also called hardware/factory unlock) can be obtained from ATT after you've finished the two years contract
2. There are online services that supply GSM unlock but it's very expensive (between $100-$200)

GSM unlock is the only unlock that can be obtained without jailbreak, this unlock is the best unlocking method, it's permanent and this is also why it's so expensive (my website does not supply these services!)

Best of luck.

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