T-mobile Bad ESN? Bought on ebay?

So i want to buy a cheap iphone 5s 64gb on ebay and unlock it on swiftunlocks for 2 $ and, i saw a cheap one but, it said that it had a bad esn number on T-mobile, correct me if i'm wrong but, doesn't t-mobile and att not use esn? They use imei numbers righ?! I'm not sure anymore, some people have been saying that carriers have been sharing blacklists and stuff like that so i don't know what to do, i'm buying it from the orginal owner so its not illegal or anything and he says all i have to do is pay 75$ to get t mobile to switch it out for me.

Is this price for the iPhone 5C a good one?

My friend is selling her phone, and I need a new phone.

- iPhone 5C (pink)
- 16GB
- Unlocked GSM
- 4G LTE connection (I live in a city, so I have that with AT&T)
- Like new condition (no scratches, dents, scraps, etc)
- No hardware issues (speakers, camera, etc work fine)

In your opinion, is $200 a reasonable price based on what I've said?

*Answers such as "iPhone 5S is better," "This phone sucks," "Get a Galaxy," etc will be ignored. All I ask is you to answer the question asked.

Added (1). Cam - I'm aware of that… Except, my upgrade is nowhere near to come. I already have a plan with my iPhone 4. If I wanted to get a new one from the store I'd end up paying a hefty "early upgrade price."

In this way, I only spend $200 and simply swap the sim card for free. No changes to my contract or plan (I've checked with AT&T.)

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