This phone can have multiple phones that operate it. There needs to be 1 manager account. The first phone that links to the phone and sets up the account first will be the manager phone. Only this phone can manage settings on the lock. That manager phone can then share access to the lock with other phones. Both phones will have to have their own separate account and the manager phone would allow access to the lock to other phones. Lock can only sync to 1 phone at a time. It operates similar to a Bluetooth speaker.
Please note the battery that comes with this lock will work for about 6 months. It is not a long lasting battery. Please replace the battery when needed with a good alkaline or lithium disposable battery. Batteries should last over 1 year.