iphone 4 16 gb + samsung galaxy tab 7 + ipod 3rd gen to buy or to swap ?

hi i have an iphone 4 on 02 it has a problem with the in call volume i have been told it is a softwere issue not a hardwere issue but apart from that it is in good condition. i also have a 3g galaxy tab 7 also in mint condition comes with box and i also have a 3rd gen ipod touch some scraches on the back but apart from that it is in good condition .i would like to swap it for a samsung galaxy s3. if you are interested please get in contact with me.