How to buy an iPhone on eBay?

Question

iPhone

Essence of the question: I want to buy a motherboard for the iPhone 4S.
I'll tell you the preview. About a year ago, I dropped my device into a bucket of water. Drowned. There was no time and no money to revive him! Now it seems that there is time and I can find a coin, but I just don’t know what to take. What parameters to look at on eBay.
I want it to work like before. I know that this model is outdated, but anyway - it's better than tapik))).
That's what confuses me - operators like Sprint, Verizon, etc., then iCloud Locked - how to understand this at all ?! Type blocked Apple ID?! And it won't turn on for me?
If there are intelligent people here - explain plz!

Answer 1

take unlocked or at&t and unlock using fusionunlock.com
it is better to buy not a separate motherboard (it will be more expensive) but just a broken scratched iPhone. Send outside the United States reluctantly and will have to use the services of intermediaries. By the way, it’s worth looking at local (in your city) ad sites, it’s often cheaper to buy a phone for disassembly there, many sell 4s, if the phone is killed outwardly, you can buy it cheap.