Carphone Warehouse is a leading Electronics brand and the website carphonewarehouse.com is its online store. Take advantage of coupon codes and promotions for Carphone Warehouse on this page listing all the best and latest Carphone Warehouse coupons and offers to save money. Most of the Carphone Warehouse offers are only valid for a limited time.Carphone Warehouse is a leading Electronics brand and the website carphonewarehouse.com is its online store. Take advantage of coupon codes and promotions for Carphone Warehouse on this page listing all the best and latest Carphone Warehouse coupons and offers to save money. Most of the Carphone Warehouse offers are only valid for a limited time.