 The European and North American use of the Internet was influenced by a large installed base of personal computers, and the growth of mobile phone Internet access was more gradual, but had reached national penetration levels of 20–30% in most Western countries.The cross-over occurred in 2008, when more Internet access devices were mobile phones than personal computers.In many parts of the developing world, the ratio is as much as 10 mobile phone users to one PC user.