All of O2’s sim cards are free to order and be delivered. They arrive in a box with a nano sim card, adaptor and top up guide. The adaptor will allow you to fit the nano sim as either a micro or standard sim if your phone doesn’t use the nano format. The guide will provide you with all of the information you need on activating your card, topping up and enabling data.
O2 provide this service for free as a courtesy to you as a new customer. They make sure that setting up with them requires minimal effort in return for your potential custom. There are no risks at all involved in ordering a free sim card from them nor does the delivery cost anything; it’s all absolutely free.
O2 offer free sim cards via both their pay as you go packages and their contract packages.