User Activity

how do i check my iphone if it's 4 or 4s
i just mistakenly deleted an item i just sold when i tried to get rid of the 2nd chance offer. anyway i can get the deleted item back? thanks.
twice buyers with zero feedback have bought my item and twice they fail to pay for it. question is if there is any automatic way or any other way to prevent any buyer with zero feedback from bidding on my item? thank you
are taxes imposed on items sold in ontario going to the usa or elsewhere? tks.
looking for a seller by name bidfortime. how do i go about it? thank you.