As also found in the official Google Android Market:

This application is a call minutes, sms, mms and data usage meter to monitor your credit usage. Never exceed your quota again!

Supporters unlock: free times/contacts/groups; widget; usage log; greater configuration of plan inclusions + more. A free 5 day trial is offered.

Please report bugs!

Please visit http://creditusage.matthewwardrop.info for more information.

Small but powerful cleaner and booster!

Best browse with full speed & less web data！Enjoy your Secure & Private time.

Xender is the best file transfer app for android phones. You can directly connected in order to transfer files, even without WIFI, 3G and SIM Card and it does not cost any mobile traffic. A movie in just 50 seconds. Support App, Photo, Movie any kind of file and format. "Connect PC" function lets you upload and download files from your phone or tablet over a wireless connection. Transfer files without a USB cable.