O2 is telecommunication holding mainly in EU but also in America. I am mainly concern about subsidiary in Czech Republic acquired by P. Kellner which I am using and about their presence and activity in country. They have some other assets in CZ such as O2 arena. It has some advantages, it is great if you use their special promotions which I have the chance to get. I have found out that they are more expensive in tariffs locally than in other countries across EU so I hope EU regulation will make the price equal all in the EU. There are other services associated such as internet, TV with special focus on sports - football etc.
There is no fierce competition in the Czech Republic. There are only two other main players so a lot of people is using O2 services.