Different retailers will offer different services for delivery, with many retailers aiming to deliver phones the next day. If your phone does not arrive on time there may be a problem with your order or the delivery. However, if your item has not arrived on the day specified it does not necessarily mean something is wrong as this may merely be due to delays in the postal service.
Where retailers use delivery services such as DHL or UPS these delivery companies should leave a notification at your home if they have attempted to deliver your phone while you were not in. If this is the case you will need to collect the phone from their local depot as it will be returned to the retailer after a specified period (usually 10 days). The Royal Mail will also leave a notification if they attempted to deliver while you were not in and you will be able to collect the phone from your nearest depot.
It may take longer to deliver items to Northern Ireland, the Scottish Highlands or addresses that are not in the mainland UK. If this is the case your phone may take longer to deliver than the period stated on the retailers website. Postal delays are not unheard of and if your item has not turned up on the day you expected it will usually arrive in the next few days.
If your phone is very late and you have not received any notification of an attempted delivery then there may be a problem with your order. You should contact the retailer directly to enquire about the status of your delivery and to check that the order has been correctly placed. Some retailers offer an order tracking service which will allow you to check on the status of your delivery.