Originally Posted by
neuromancer
Well, they want to make sure you fit the profile - if they interview people in the US, and when you say you live in the US they want to make sure you are from the US.
It can be a fixed number, no need to be a cell number.
They know where you are- location of the server is a pretty good indicator. When traveling outside of the US I've gotten messages that I can't access a particular survey because I"m not in the US. (It's not perfect- I once had issues getting into a Fidelity account when in India and when I called they asked if I'd been in HK. I hadn't, but my employer had servers in HK.)
It's just another grab for information. It's one of the reasons I keep a landline as the equivalent of a spamcatcher e-mail address.