Worst network I've ever been on. No 4G coverage in my area despite their online map saying that there was (false advertising). I rang up to cancel my contract and after speaking to about 6 people I was told that I would only be charged for the current month. I then requested a PAC code and they told me I had to pay an early termination fee. After speaking to more people I was told a manager would call me back in 48 hours. A week later, I still hadn't received the call so I went to the local o2 shop. They were unable to help me but gave me an email address for complaints. After speaking to numerous other people and threatening legal action, I finally got a credit on my bill. Avoid at all costs - network coverage isn't as good as they claim and customer service is non-existent