Selling a blacklisted iphone on ebay?

My older brother is trying to get out of a contract but has an over due bill that he wants to pay. I'm trying to help him for a way out and I thought about selling his phone over ebay. I'm not sure if his phone is actually black listed yet. But his service is off, the phone my brother has goes for $300 and more which should be enough to pay off his bill, and the termination fee (if there's one) and get rid of his phone in one move and the phone will no longer be black listed when the other person has it since I'll pay it off when the buyer pays us for the phone (If that's how it works.)
could I sell a black listed phone, provided that I notify buyers, allow return shipping or whatever in case they feel uneasy about buying it. I have a 100% feedback rating already so that should be helpful with trust

Can't download bt notifications on iPhone 5s, what can I do?

I recently bought the U8 Uwatch pro smart watch and I have it connected to an iPhone 5s but not everything works. To get everything working I need to install the bt notifications so I download a file from the website the watch says to an app that I needed to install to have access to that file, but then I can't download it onto my phone which is what I need to do. What can I do to get the bt notifications downloaded onto my phone and fully working?

My iphone emails keep showing a J?

Ok, everytime i send an email to someone, they keep saying that i have a "J" at the end of the message. Can any genius tell me please how i can stop this on my iphone?

3G not working on iPhone 5s?

3G doesn't cut in when I turn my Wi-Fi off on my iPhone 5s even though I've got mobile data and enable 3G on.

I have an iPhone 5s that I bought online. Is it real?

It all looks legit, including the os. However, the info on the back cover looks different. It has the usual "Designed by Apple in California Assembled in China", but all the stuff below is in Chinese. There are only two icons/logos lined up at the bottom. Neither of them are on the usual iPhone. Is it fake or made for china or something?

Selling someone else's product on eBay for a marked up price?

I'm just wondering if this is allowed on eBay…

Lets say I go and find an eBay user that sells iPhone's for let's say for £269.99… And then I go away and make a listing on my own account and sell exactly the same product for let's say £279.99. Same product, same everything just £10.00 more.

We can assume it is likely because this product is so popular that before long, someone, somewhere, will not shop around properly and decide to buy my iPhone for £279.99. They then pay me for it and I then go back to the original seller, pay him £269.99, give him my buyers address and keep the £10 difference.

The customer gets the iPhone, the original seller get's his money and sells one of his items and I get £10 as the middle man. Is this allowed?

I have an IPhone 3GS on 4.1 firmware?

I have an iphone 3gs on 4.1 firmware apparently all the images which is in phone i can't get it becoz they are no longer in my pc and itunes doesn't detect it becoz they do not support that firmware i need to get all the images, videos and music out of it can some advice me how to get it?