o2 Contract Phones If you want a good mobile phone plan from a reliable network, we recommend that you look into O2 deals. As many of you probably know, O2 is one of the biggest telecommunications company in the UK. Not only does it have great mobile phone deals, this company also has amazing broadband internet access products. In other words, it is easy to find amazing O2 contract deals today with all the minutes and texts you want together with data plans.