Buying IPhone 3GS 2nd hand question (PAYG)?

Hi Mike with the 3gs version of the i-phone second hand depending where you buy it from the avereage price goes from around �130 for a working 1 ! you get 1 cheaper if it has a fault ! if your in the uk i would look at a site called gumtree & the phones that are in your area you may find a good deal there .. hope this helps .. sly