Trial a Nokia Lumia 710 or Nokia Lumia 800 outright in March 2012 and if you are not completely satisfied with your purchase bring it back to the same store within 30 days for a full refund.
30 Day Trial Offer!
30 Day Trial offer ends 31 March 2012. Unit must be returned in good condition with all manuals, cables & packaging. Proof of purchase must be provided. The store will then apply for an RA as per normal procedure - listing 30 Day Trial Promo in the description. Money back guarantee applies only to handsets purchased outright and not on a contract.
Then they can pretend it is brand new after you return it and sell it as such.