It is according to the long time testing and inspection of cell phone jammer

See computer black dialog box prompts (see Figure 14, Figure 15) is automatically written to: Figure 14 .... 15 .. 6. At this point, if the prompts to complete, congratulations, you succeeded in brushing the ROM (the new system ), disconnect the USB, restart the phone. (D) Brush Brush with recovery, commonly known as card! Note: Brush ago that more than 50% charged, otherwise the risk of a brick, this .. you know. The first step: Brush recovery: 1. Update.zip put on your SD card (memory card), you need to C8500recovery.rar on the desktop (desktop easily find) Extract (see Figure 16). ..... 16 .... 2. phone and the computer is disconnected. And shutdown.It is the feedback information of  cell phone jammer from the site customers
This was in line with the situation of the domestic mobile phone. From 2006, major international mobile phone brands integrate their marketing channels, and increased efforts to develop low-end mobile phone, a large number of thousand or even lower models, but this piece has been made mobile phones occupy the market has been broken. According to CCID Consulting statistics show that only Nokia and Motorola brand, the sub-quota of 500-700 yuan mobile phone market has been accounted for as much as 57% in the mobile phone market share in less than 500 yuan up to 70% of and more. The low end of the market fall led to the current plight of the domestic mobile phone, just as the core competitiveness of a product is being challenged, even slowly lost.And ask some technical professional questions about cell phone jammer 
From the state of development of the domestic mobile phone in 2003, the domestic mobile phone market share reached its peak in 2004, began to turn bad, and during this period affect its important reason is the domestic mobile phone use inappropriate sales practices - TV direct sales. Domestic mobile phone market share in TV direct sales compared with the foreign brands did occupy a large half of which made mobile phones in 2003 through the channel innovation occupy nearly 60% of the market are very similar. However, in 2004, the domestic mobile phone sub-quota has begun to directly turn to the next in a massive attack of the foreign brands can only maintain about 30% sub-quota. Was the rise of the domestic mobile phone, primarily through the marketing channel innovation.
articles from:
http://phonesignaljammer.noahblog.com/
http://phonesignaljammer.blognet.me/
http://phonesignaljammer.ajatukseni.net/
http://phonesignaljammer.bcz.com/