How many phone numbers do you remember? I remember 10, I think if I exclude the ones that I remember correctly but are no longer used [landline numbers of childhood friends :)]. I think ours was the last generation that even bothered about remembering phone numbers. Anyone born after the landline era doesn't "need" to remember a phone number anyway. Heck, even we don't bother to remember numbers now. It's all there saved on the phone. Always available to us at the touch of a single button.