O2 say that the courier will return it to the depot if you're not in:
From the FAQs page:
Frequently asked questions
Where will my order be delivered? To protect your goods, we will only deliver your items to your home address.
What time will my phone be delivered? It will be delivered between 7:30am and 9pm, unless you have selected the "Before 10am" or "Saturday before 12 noon" delivery options which cost £10.20. We are unable to specify an exact time that your phone will be delivered.
Does someone need to sign for my phone? Yes,because of its value a signature will be required
What happens if I am not at home to receive my phone? If you're not at home to receive your phone, the courier will leave a card with details on how to contact them to rearrange delivery or to collect the phone from their depot.
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Sky Unlimited Broadband - Windows 10 - Nexus 4 Android 5.1.1
