Ask yourself a question. How many apps do you use on your smartphone that require mobile data?
Chances are that it is the vast majority; calendars are often synchronised with online services and so are contacts, social networking, weather information, many games and almost any other app you use. A smartphone without mobile data is merely a tool for making and receiving phone calls in 2012 and yet this is an area that many people do not consider carefully.
Much thought is put into choosing the right phone and everything from the style to the specifications to the battery life is thought about at length. A customer will then often go to the supplier that offers the phone they want at the best price, with a presumption that the new network will work just the same as the old one. This is rarely the case.
In every area within every country, mobile network performance varies between providers and it is extremely rare for each provider to offer exactly the same performance in one area, let alone where you live, work and visit regularly. It just does not happen and in the case of mobile data, coverage is only part of the answer. Capacity is just as important to ensure that you can view the web pages you want to and speed will make a difference as well. Without capacity, coverage and bandwidth a smartphone will not perform well no matter how well specified it is.
When choosing a new smartphone, always ensure the mobile provider you choose is able to match the phone for reliability.