How long a delivery takes and whether you need to sign for it depends on what you've bought:
These are delivered within one to two working days. Dongles and SIMs are delivered by Royal Mail, so you don't need to sign for them. To get an update on delivery in your area, please visit Royal Mail's website.
Orders placed before 4pm will be delivered by courier the next working day. Orders placed after 4pm will be delivered in two working days (or on the following Tuesday if you order after 4pm on a Friday). You'll need to be in to sign for your delivery.
Your dongle and laptop will be delivered by courier within three working days. You'll need to be in to sign for your delivery.