Why does the BlackBerry 9900 generate traffic by texting?

Did you use Fetion? Fetion collects traffic and doesn't spend money on text messages. Of course, it is also possible that there are pictures or expressions in the text messages you sent, which need to be uploaded. Of course, 9900 is a smart machine. Please check whether there is any software that consumes traffic in the background, such as QQ, browser and so on.