A new tweak whose name is DataMonitor and that allows us to control the data traffic consumed by our iPhone, both by WI-FI and by 3G.
If we have a data rate limited by a maximum monthly consumption, DataMonitor allows you set daily or monthly consumption alerts based on the plans you have contracted with your operator.
Beyond this, DataMonitor offers daily and monthly statistics, customizable data, battery information, RAM memory usage, CPU usage, information about the system and about the firmware that our device has installed.
Without a doubt one of the most comprehensive tweaks we've seen in a long time and best of all, DataMonitor can be downloaded for free from the BigBoss repository.
Source:iDownloadBlog