You might have phone service for 20 years, pay each month by check, and never miss a payment. That will never show up on your Credit Report. But if you miss one payment, the phone company will gladly report you, regardless of the reason, to credit reporting agencies.
Financial Institutions however do report to credit reporting agencies regularly regardless of whether it's a loan or a credit card.
Having nothing on your credit report isn't necessarily a bad thing, but having a record of making monthly payments is even better. A loan costs money, in the form of interest, but a credit card doesn't necessarily cost you anything. So the theory is that you can acquire a credit card with little or no credit history, and demonstrate your ability to pay off a monthly balance and the credit card company will report that activity.