n3tfusion wrote a little application for WM6.1 mainly for the users of the Belgian mobile service provider “Mobile Vikings”.

Quote:

Features:
– Show the expiration date of your free data/sms
– Show the remaining credits(€), data and sms.
– Show the call/data/sms/mms history
– Show the Topup History
– Phone number = Contact’s name
– Auto-Update ( choose between 5-10-15-30min-1h-2h-3h)
– Notification Bubble for Auto-Update to get an quick Sim Balance info
– Language : French, English, Dutch
– New UI, Manila Look with Kinetic Scrolling [ Thanks to michyprima ! ]
– Date Picker for History

Important!
You need the .net CF 3.5 !

Changes:

[28/10/2009]1.04 -Phonenumber is replaced by Contact’s name ! Some bug fixed, new arrow pictures, The 3 parts are now updated separately, auto-update : only the sim balance –> New button for update the topup.

http://forum.xda-developers.com/showthread.php?t=565601