If you do not have a Facebook account you will not be able to link your city and you may lose it.
So if you don't have a Facebook account, make one up. Just by creating a fake profile you can link your city and you will already have it protected as long as you keep that Facebook account. To create it:
- Create a new email in Gmail.
- With that Gmail account, create a Facebook account with uncertain data, so that you create a fictitious identity. Create a "credible" identity. You don't need a phone number to sign up for Facebook. When you are asked for a phone number, there will be a link that says "sign up with email account", which is where you should click.
- The Facebook account will ask for confirmation in your Gmail email.
- Confirm the Facebook account.
- Link the Simcity BuildIt city with your new Facebook account, through the game settings in "Login to Facebook".
- Enter your new Facebook username and password.
- It will return you to the game and you will have your city linked to the fictitious Facebook identity, and you will never lose that city again.
(*) Contributed by Atlantis