It really depends on the company. Lots of call centres pay minimum wage if they are outsourcing type centres. If it is a unionized centre it will pay more.
A call center job generally pays its employees minimum wage. Minimum wage varies from state to state, so you must find out what the rate for minimum wage is in your current state.
It depends on experience normally. If you have a lot of call center experience your pay will be higher. But if not they have to spend more money to train you.
It may depend on the area you live in and the cost of living there. You can probably expect anywhere from minimum wage to around $15 per hour. I would say the average is about $9-12.