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.
Ryan