Best answer by Ryan
It is unfortunate to hear that your phone has developed a fault. Usually, the Carphone Warehouse would be able to repair your phone under the warranty, however, certain aspects can affect the warranty status of the phone, and a cracked screen is one of those issues that is not covered by the warranty.
Even if the fault is not linked to a broken screen, it still voids the warranty as a whole and the next step is to undertake a chargeable repair. You could speak to the manufacturer and ask them for assistance, but it's likely they will reject the repair too based upon the accidental damage to the device.