Thanks all for the reply.
Upon installation of the app, it asked for my first name and last name. Do I have to use the real name? I am a bit hesitated to give out the info to unknown taxi drivers.
From iTunes Preview, I read some Customer Reviews and tried the $20 coupon codes. The first one "UberNSJ72" is not valid but the second one "UberBEN44" works. Then, a screen shows up on my iPhone saying that I get $20 off in the first ride with Benjamin's promotion. Then, it asks for some kind of credit card information or PayPal.
I don't know where the money from Benjamin's promotion came from. Not sure if it is from Uber Technologies, Inc. or some user. If I enter my credit card number, will the one who offered the promotion code get access to my credit card information? Do I have to worry about it?
Besides Paypal and credit card, can I pay using iTunes card? Anybody succeed in doing that?