The mobile phone market experienced steady growth from the 1990s to early 2000s as infrastructure costs decreased and service revenues increased, allowing providers to expand into new markets. By 2001, cell phone tower infrastructure in the U.S. was nearly complete, reducing capital costs and enabling providers to focus on more efficient network equipment and expanding abroad. Subscriber numbers illustrate this growth, with over 215 million subscribers in Asia, 45 million in Europe, and 45 million in the U.S. by 2005, compared to just 14 million globally in 1990.