In some cases, Amazon shows this error to people who try to verify their account via phone:
"Amazon is prohibited from making calls to the number you have entered. Please enter a different phone number and try again."
Some solutions to this include:
1) Use a free service like:
They provide a US number you can use. You will receive the call to your cell phone. If you need to, here's how to find your cell phone's IMEI or MEID number.
2) You can call Amazon directly.
If you are calling from within the U.S. or Canada: 1-866-216-1072
Article ID: 231
Category: Amazon registration, Access API Keys