Is this sale on twitter legit or is he trying to scam me?

I messaged a guy on twitter about iphones he says hes selling. He seemed legit until he said that I had to pay with a vanilla card. I don't understand if this is secure or not. He claims that there's two serial numbers and if i give him one than he will get verification of the payment or something. It sounds to me as if its a scam. Can someone please let me know your thoughts. Also heres a link to my convo.

Is it possible to remove IOS from an iPhone, and re-install it?

My iPhone 4 is stuck in recovery, I can't update, or restore. I've tried everything I could possibly think of at this stage, and I've still had no luck. My question is probably going to sound ridiculous, but is there a way to wipe the entire phone clean without restoring, and then install the IOS again, to fix the problem?

I've tried two different laptops, a mac, different USB cables, different iTunes versions, DFU mode, etc. But nothing has helped so far.

Any suggestions would be greatly appreciated!

Iphone 6 or iphone 5s which one is good to buy?

Am planing to buy Iphone, I'm so confused that which one to buy Iphone 6 64 gb or I phone 5s 32 gb, And I had watched the Iphone bending video also which one is bending I phone 6 or 6 +, and sugest me some ideas.