Hello I contacted your support Azure France by phone this day. I recreated an azure account via your azure portal. At the time I was invited for a session and I did not need to fill in my own credit card number.
Second point I reported to help you that there was a bug on the free or paid subscription form when entering the phone number the problem is resolved to 80% it remains a problem of posting to the input of a French number, but the verification code arrives well by SMS.
My second concern I have a particular bank card and we forced to enter it. I find this solution limit for the security of the particular customer or company.
Let's say the bank card of a professional or an individual is stolen or hacked or your servers are hacked.
Why not use a prepaid subscription card system for the year or trial period. Xbox Live Methodology.