RIM's Blackberry subscriber base grew from 2.5 million in 2005 to 4.9 million in 2006, while telecommunications costs have risen to become a major expense for companies, often with 12% to 20% of charges containing errors. Utilizing a service like i tem ize improves telecom expense management, saving clients significant amounts of time and money while enhancing visibility and control over telecom charges. Clients reported substantial labor savings and the identification of thousands in credits and potential annual savings, validating the effectiveness of the i tem ize system.