[GadgetKen]

This could be intriguing in terms of:
1) If they hooked Skype-In VOIP directly to the United Mobile/Mobilekom Liechtenstein switch, someone could call in to a less expensive(and possibly local) number in the UK, US, etc. United Mobile/Skype would profit from the charges for a Skype-In number.
2) Direct dial (callback without using Callback World,etc.) rates might be less because the long distance portion would be carried by cheaper VOIP Skype. Concern though is audio quality...VOIP connections not always the best.
3) If used with a GSM/Wifi handset, you could have cheaper WiFi VOIP when in range of a wifi site, and a single account (instead my seperate Skype and United Mobile accounts). Not sure about their free mobile telephony claim though unless it was wifi VOIP to another wifi handset.
4) Possibility of data services (GPRS, etc.) if they are going really high tech with VOIP anyway?
These are all guesses about what United Mobile might do, but hopefully they will implement some of this.