You can make calls any time of day, any day of the week without the need for a long term contract.
All subscriptions contain online numbers that let your friends, family or business contacts reach you directly on Skype.
And with your Skype To Go number you can reach your friends and family abroad at great rates using any landline or mobile phone.
10,000 minutes limit for calls per month. That's one whole week of talking (landline only though)
European Calls : £3.39 per month
Worldwide calls to 34 countries : £7.99 per month
I will try to find out whether you can use it with the 3SkypePhone.
Note that this replaces the SkypePro package