We’re not going to lie — Windows Mobile is not our favourite mobile phone operating system, mostly because it’s about as stable as a three-legged donkey. However, a newly-customised version for Telstra mobiles does promise a few goodies. Mitchell Bingemann at AustralianIT reports that Telstra has co-developed its own branded interface for Windows Mobile 6.1. The most appealing feature is a built-in system for using a phone as a PC modem, an appealing option given promised speed improvements to the platform. Like those improvements, there’s a delay; the first handset sporting the interface will appear in April.