Good News for Pay&Go

http://www.o2.co.uk/terms/freesunday/

Free Sunday Terms and Conditions
1. On Sunday 24th October 2004, all O2 UK and O2 Online customers on Pay & Go Original, Pay & Go Talkalot, Pay & Go Talkalotmore and Pay & Go Wild making standard calls in the UK to UK standard fixed-line numbers or to UK mobiles shall not be charged for their calls. All calls to premium rate numbers, Directory Enquiries, calls whilst roaming and calls to non-UK numbers shall still be charged as per the customers' tariff.
2. The offer only applies to all eligible calls initiated and completed between the hours of 00:01 and 00.00 on 24th October 2004.
3. Customers with zero-balance calltime credit on their handset need to top-up to reactive their mobile before they can take advantage of this offer.
4. O2 accepts no responsibility for any tax liability caused or incurred by an individual or business relating to this promotion.
5. Promoter: O2 (UK) Limited, 260 Bath Road, Slough, Berkshire, SL1 4DX.

these two free number of international call valid for 3G and O2 monthly tariff. for pay as you go, only valid on weekend and charged by 2 p per minute
0870 794 4660
0844 570 4660
for monthly rental, 0844 570 4660 even works during the week days. So just use it, enjoy yourself!
because these two belongs to new opened line, it has got very good voice quality and never lose the line