Your OP and then your replies to questions within this thread are very contradictory.
How it works:
I will only accept your money when i can do it right then and there, not before not after.
That sounds like a wonderful way for you to get money in your hands without taking responsibility for the product you're promising.
so no escrow ?
That's what paypal's for!
These posts would make it seem like you are unwilling to accept escrow, and that you would be using PayPal as a substitute for an escrow. PayPal is not a sufficient escrow, and it does not protect anybody.
for bitcoin payment, I do accept escrow
Then you say this and I am completely confused.
So are you accepting escrow or are you not? I'm going to assume you're accepting Bitcoin, otherwise you wouldn't have said this.
I honestly would be willing to buy this if you are willing to accept escrow and the terms that the funds are not to be released to you until the condition/function of the phone has been verified. What do you think ?