Giacomo Guglielmi has Data Cellular Counter Pro (iTunes Link) for the iPhone and iPod Touch in the iTunes App Store for FREE (regularly 99-cents) for a limited time.

If you’re worried about exceeding your daily, weekly or monthly limit for data usage, it’s time you got Data Cellular.

Data Cellular keeps an eye on your data traffic by providing you with useful info so that you can use your mobile worry-free.

You will be updated in real time because Data Cellular collects your data directly from your mobile, not from your service provider.

It’s easy to use and you can personalize it to suit your needs.