If you’re using Authy apps on multiple devices, you can use your alternate device to deauthorise your missing phone from producing valid tokens. The password feature on the Authy app will also protect it from unauthorised access.
When you obtain a new phone, you will be able to access all of your accounts by registering the app again using the same phone number.
If you've changed your phone number, please contact Coinfloor Support choosing "2FA reset / change phone number" as your question type. To ensure your account security, we will require that you respond to a number of security questions to register your new phone number.
If you experience any issues with registering the Authy app on a new device with the same number, you may find helpful advice here.