1. 'UK's Lowest Price' applies to the price of the monthly line rental on new subscriptions, where there is no upfront cost for the handset. Excludes cashback and other promotional offers. **Any phone is classed as a phone purchased in the UK within the last 10 years. This offer is valid on Samsung Galaxy S5 or HTC One M8 pay monthly and upgrade contracts purchased from Carphone Warehouse from 11th April 2014 until 11th May 2014. Exchange process must be initiated through promotional link www.carphonewarehouse.com/tradeinpromo in order to receive additional £100. £100 will be automatically added to the value of the exchange. Maximum of one exchange per connected Galaxy S5 or HTC One M8. Exchange amount will be sent to customer via cheque or BACs transfer once approved. Click here for full exchange terms and conditions.