They need to call your over the phone in order to verify you are a human being and they need to know what you are going to do with their "cloud" - they called it "Onboarding"
I told them I just want to experiment with their apis and maybe they think I have no business value or I am a potential spammer, so they rejected my "Onboarding" request without any reason given. (So you know I am not commenting from the technical point of view since I have never access to their system)
On the contrary, AWS give you free tier access for a whole year, no question asked.
IMHO, don't waste time on Rackspace.
Also, their sorta-cloud-sorta-VPS setup for Rackspace Cloud seemed awkward to me. It made the control panels more confusing than they needed to be.
I really like openstack. As a python hacker, it's the bee's knees.
We're moving away as quickly as possible to Linode and AWS.
Like I said, Rackspace's model of hiring great people and giving premium service worked great in the old days pre-cloud, but now the people are poor quality as the company has grown, the underlying tech is horrible, and the billing and other services so bad that you can't justify the premium prices anymore.
Rackspace servers and service (in all forms) are considered harmful. Just go with AWS or Linode.
But Unlike AWS where you get all the other AWS features and services via API and a half decent price if you play their reserve pricing and bid game. Rackspace has NONE.
Background - my employer hosts on dedicated servers at Rackspace and we're considering using more of their cloud offering.