Credit Limit

[#1]

Could someone let me know how I reduce my credit limit to £0
Thanks

[#2]

Raise a ticket - but I suspect that the minimum is £5
HOWEVER
If you do that and make one chargeable call then your phone service will be blocked and you will be hit with a £5.76 charge
http://www.plus.net/support/phone/credit-limit-and-top-ups-guide.shtml