Calls made to 900 numbers can be billed in one of two basic ways.

Most services charge callers according to the number of minutes spent on the phone. This fee can entail a constant per minute charge, or can vary, with the first few minutes costing a certain amount and the following minutes assessed at a different rate.

Calls can also be billed on a flat rate, which results in a set charge regardless of the amount of time the caller is on the phone.

Most calls are billed on the caller's local telephone bill. However, some 900 numbers allow the caller to bill the call directly to a major credit card.