Nice the Yakie service but you can do this yourself using a manx sim card.
Get an account at
www.pbxes.com (free)
This is a virtual pbx.
Get yourself a sip number, for example
www.stanaphone.com gives you a free New York number.
Configure pbxes.com using this number.
Get credit for a sip/voip provider. for example I am using
www.voicetrading.com (for busnisses)
The will let you make calls to the Manx mobile number for 10 eurocent per minute (1 sec billing)
Now forward your stanaphone number to the manx number.
This way you can receive calls on your fices line, forwarded to your mobile at only 10 cents per minute.
Even better you can get a UK, German or any other sip DID number and configure this on your pbxes account.
When paying 10 euro per month pbxes also offers a callback service and you can use this to call youself. pbxes calls you back at 10 cents per minute and you get the pbxes dailtone to dial out at low rate.
This service is much better and cheaper and you have more control yourself.