[t_von_doom]

The skeptic in me says that people would take a freebie regardless of whether they actually need it or not.

Maybe a slight improvement would be to offer the phone at full price minus the RRP of the charger. Then if it's necessary the customer can pay the 'full' price as it introduces a perceived cost

[kall]

Make it a coupon for any accessory (case, charger, headphones etc) or play store credit and most people will probably get something they would have gotten anyway.