I use Google Authenticator on all accounts that offer it. Using a cellphone # is not a good idea because it is easy for impersonators to call your carrier and have it changed without your knowledge. Google Authenticator is great because it is attached to your device and your device only. Without the physical phone, there is no way to gain access.
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I was not aware that you can use the Authenticator without a phone number. This is very insightful. Thanks.