Here it is explained how to turn off 2-step verification. If you don't have a mobile app or a mobile phone for verification, you should have received temporary codes. If you did not save them, well, then just follow the link below the login box where it says "Can't access your account?".
Currently suspended due to work on a new authentication verification program.
Follow @verified for updates.
We've paused public submissions for verification.👇 (posted on 11:55 PM - 26 Feb 2018)
We're working on a new authentication and verification program. In the meantime, we are not accepting any public submissions for verification and have ...
Requesting a blue verification badge
Verify you have all that in the list, and submit a request with an official government issued photo identification. It's encouraged to include additional information to help review your request.
Note: It seems that the option for requesting verification isn't available in every country.
How do I request a blue ...
You will have to revoke the application specific password which you had probably setup for your Kindle. Then reauthorize the device with username, password like earlier.
Here is Google's support document on turning off two-factor authentication.
Edit: I misread your question and provided the answer which works when you have 2fA enabled!
My earlier answer:...
As described on the Twitter help pages:
I lost my phone
If you are no longer logged in to your account and do not have access to an active backup code, please contact Support for assistance
Note: If you're still logged in to your account, you can remove your phone from your Mobile settings on twitter.com. Click Delete my phone and login ...
It takes 48 hours to one week or sometimes one month. There is no fixed time for it. It depends on which policy you have violated and why they have asked for photo verification. If they reject your picture, you have to contact them again. There is no other way.
There is no official way provided by Facebook to make this process go faster. You may contact ...
It's the other way round. You should ask people for their screen names in an email (not saying emails cannot be forged, it's simply that inviting total strangers to your organization is not reasonable).
The "correct" way of accessing your Gmail in this scenario, is to create app-specific passwords:
App passwords allow 2-Step Verification users to access their Google Accounts through apps such as Mail on an iPhone or Mac, or Outlook. We'll generate the app passwords for you, and you won't need to remember them.
You will generate one password per client, ...