http://www.btplc.com/age_disability/phoneservices/services/directories/index.htm The following is taken from the above website If you are registered with the 195 service or you receive your BT phone bill in alternative media you can use the 1471-3 service. This means that you will not be charged for pressing button number 3 to ring back the last person that called you when you use BT Answer 1471. If you think you should be getting this service free of charge please ring 195 to check Hope this helps Ellie