^ Trade in value as of 17/04/2014, prices may change on a weekly basis *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. Trade in 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 trade in. Maximum of one trade in per connected Galaxy S5 or HTC One M8. Click here for full trade in terms and conditions. Trade in amount will be sent to customer via cheque or BACs transfer once trade in is approved.