Mobile USA , Inc . , Virgin Mobile USA , L.P. , and Bluebottle USA Investments L.P. included at the end of this release. was $ 291.4 million , a decrease of 5.9 % versus the same period last year. industry-wide trend of substitution of lower-priced messaging for voice. from 10.1 % in the second quarter of 2007. half of 2007 when the tax receivable agreements were not in effect. marketing investment by an incremental $ 13.3 million year over year. from $ 13.9 million in the second quarter of 2007. year , reflecting the success of the Company 's newly launched service plans .