YSK that when providing credit card information over the phone, it is unnecessary to tell them what type of card you have My job mainly consists of taking payments over the phone, and when I ask for the card number, so many people start with “it’s a visa/Amex etc”. It is not necessary to specify, because we can tell what type of card it is after you read the first number. The numbers on Visa cards always start with a 4, Mastercards always start with a 5, discover cards start with a 6, and AMEX cards start with a 3. Why YSK? Because it’s unnecessary and lengthens the phone call that we’re both trying to get over with as quickly as possible