As a blogger, I've come across an interesting question: "Is 0 in a telephone number pronounced like O?" After some research, I found that many people tend to pronounce 0 as 'O' in phone numbers. However, it's important to remember that '0' is a numeral and 'O' is a letter. The correct way to pronounce '0' is actually "zero." In conclusion, while it is common to hear people say 'O' instead of '0' in phone numbers, the accurate pronunciation should be "zero."