Iphone 4 black on 3 netwrork fully working great condition 16gb -

Right, i have 3 iphones altogether from family who have all upgraded, all black, on 16gb and fully working with great condition. The first one is my iphone on 3 which is 200, the other two are possibly on orange and t mobile but cant be sure and am selling these at 175 each as im not sure of the network. If for any reason these iphones do not work which they will, i will be happy to take them back and give a full refund. All sent first class insured or can be collected, a recipt will be given