There are many different CBB Mobile service providers that you will come across online which could make it a little confusing for you to pick the right one to order your subscription from, either as a one off thing, or a regular process. However, if you have your criteria established for finding such resources, you will be able to get your answers without having to spend too much time on it.
Mobile phone services are popular everywhere, though online versions have only just become feasible to many given that the only affordable choice used to be to commute to a local shop to have your stuff taken care of. The idea behind an online CBB Mobile service is to make the whole thing simple and convenient for anyone with an access to the internet to be able to meet their day to day requirements.
Going to a local mobile phone shop may not be the best of ideas for people who may not have time to do that. It may also not be an option to people who may be traveling to certain areas where such stores do not exist or if they do, they may be far away from being within easy reach. So, basically online shops make 'cbb mobile talk time subscription' (also known as 'cbb mobil taletid abonnement' in Danish) deals more convenient and easy to go for.