Will a Sprint iPhone 5 with a bad ESN number work for At&t?

I found an iPhone for sale but I want to know if I'll be able to use it.
Its originally from sprint with a bad IMEI or ESN number but its unlocked so can I use it for AT&T

Added (1). What if it is unlocked already?

No. Sprint uses CDMA and AT&T uses GSM for their networks. They are incompatible.

No, you need to contact sprint for the bad ESN. Even if it unlock, it is still unusable. Carriers only allows phone with clean ESN or IMEI.

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