Although Chinese domestic mobile phone industry is not flourishing as a whole, there are still venture capitals that are optimistic about this market. Yesterday, domestic mobile phone enterprise Tinnuliangtong and American Warburg Pincus signed a strategic cooperation agreement. Tinnuliangtong in the domestic mobile phone industry has been called "invisible champion". A reporter learned from an insider that the investment amount this time was about RMB 5 billion yuan, but this statement had not been verified by both parties. According to Rong Xiuli, chairman of Tinnuliangtong, Tinnuliangtong was founded in 2004, obtained mobile phone license in 2006, and launched mobile phones with the brand name "T-Kouch (Sky)". Since Tinnuliangtong was originally a mobile phone distributor, Tinnuliangtong adopted a 100% contract manufacturing model, fully utilizing the role of distributors, and only retained R&D and after-sales service personnel.