How do I disable SMS based 2FA and use Authy instead

Once you've set up SMS 2FA, you can download and set up Authy with the registered number. 
SMS 2FA can then be disabled in your account by going to "Profile and Settings", unticking "Send 2FA token via SMS" and clicking update. 
Now to log into your account, you will need to use the codes generated by the Authy app
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