I hate bullshit interview questions like "What is your greatest weakness". Your weakness is that you too readily tell your weaknesses to others, fools!
And such an uninspired question shows a troubling lack of creativity in the interviewer. "Put down the phone, go get someone qualified to do your job, and bring them back here so I can talk with them"
But of course you can't say these things.
My advice would be to go online and find lists of interview questions, and answer them yourself on paper. Just so you can identify places where you're having trouble. When you take the phone interview, don't look at your sheet of prepared answers. That's just for practice.
Then investigate the company. They will ask if you know what the company does, and if you have any questions about it. Don't try too hard to come up with questions of your own, and don't delve into "private" things like the company's finances or whatever.
And don't ask procedural things like "Do you have an employee handbook" because if they do, they'll be sure to give it to you. Things like that might be taken as advising the interviewer on how to do his job. People can be stupid sometimes.
Also don't get too involved right out of the gate asking about benefits and stuff. The company does not want an employee who knows about the employment laws or how things work with Human Resources. They want someone who does not know his administrative remedies, who has not had dealings with the law or the police. They want you to know your job, but they don't want you to be knowledgeable enough to prevent them from screwing you over.
Don't be a boring grey block. But don't tell them about your morality, politics, religion, sexuality, or really most opinions. Again, they want 100% dependability. Only some jobs require you to be anything more than a very functional robot. But if the job description talks about creativity, mention some creative things you do that aren't too controversial.
Bottom line: it is okay to lie about your personal stuff, but not about your education / work experience. They don't need to know who you really are. After all, they don't tell you who they really are.