What if I lost my phone, how can I unlock my drive?

You can always install DataLock app on your new iPhone or Android device, see How can I download the DataLock App on my smartphone? DataLock app could be installed on multiple phones.

Caution: If you previously enabled “Use this Phone only” feature How can I ensure that only one specific smartphone can unlock the drive? then unfortunately there is no way to unlock your drive if original smartphone is lost/stolen/damaged