Apple iPhone 4S 16GB, 4 weeks old, factory unlocked ?

Hi folks, selling my 16GB black iPhone 4S due to needing the funds really. Phone was bought outright from the Apple Store Braehead on 1st May 2012 so still has more than 11 months warranty remaining. The phone is in mint condition, and was bought sim free so will accept any network micro sim. The phone comes boxed with all accessories including charger, USB cable and headset. May be willing to take part exchange with another handset so let me know what you have as I will need to buy a new cheaper phone anyway. Any questions, please email or text and I will get back to you ASAP.