My point exactly. Read the contract, and you'll be equipped for an intelligent conversation.
No.
9 times out of 10, you will NOT have a contract to read before the phone call. Most agencies won't send a contract without reasonable expectation of signing, and they don't get that until after the phone call when you give them confirmation that you're going to choose them as your agent.
Some agencies actually have policies preventing their contracts from being read by / sent to non-clients. It's a form of non-disclosure. (legit, enormous agencies like WME) And you can't trust any sample contracts you might find online.
It's best to sit down and write out several questions that you would like to ask a prospective agent in advance. A good number of them wouldn't be the sort of things spelled out in a contract, anyway:
What's your commission?
What changes do you foresee needing to be made in the manuscript?
Do you read yourself, or have a reader?
How long is your average response time / how long do you generally take editing a piece before it goes on submission?
How long do you generally keep a manuscript on submission?
Which editors do you work with?
Would you possibly be able to put me in touch with an existing client?
What's your agency's position on self/assisted publishing? If I want to experiment with something, will you help me get the manuscript in order so I can publish it myself (for a commission on sales, of course)?
Should you retire, what's the agency policy on retaining authors?
etc, etc, etc.