If you’re using Authy apps on multiple devices, you can use your alternate device to de-authorise 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 and retrieve your phone number, 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 Exchange UK 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. Once your identity is confirmed our Support team will act swiftly to re-enable your access to your Coinfloor Exchange UK account.
If you experience any issues with registering the Authy app on a new device with the same number, you may find the helpful advice here.