PRO/Ultimate subscription activation code is needed to activate the PRO/Ultimate subscription functions in the user account. It means that the code is assigned to the one, unique user account and don't have an effect on any OBDeleven devices. If you have lost your device, you can buy a new one without PRO/Ultimate subscription license and use it with your existing account on which PRO/Ultimate subscription license is activated.

Connecting different phones or tablets have no effect on device itself, so, you can connect with unlimited number of phones or tablets to your OBDeleven device.

If you have already used the activation code you will not be able to use that code again with another account.  

This adpater is usable on vehicles that have complicated access to the OBD-II diagnostic port. I.e. Škoda Octavia II or Audi A8 D3

Also, it can be useful if you are using OBDeleven often on many cars.

The OBDeleven application does not have a limit of cars to connect with the device. One device is enough to connect with different cars which are supported by OBDeleven. 

Credits are an in-app currency that lets you activate various comfort features with ready-made applications - One-Click Apps. They are free only with Ultimate subscription plan.

The one-click app is a prepared functions to enable or disable the car features. The number of one-click apps for your car depends on the car equipment.

Third-party adapters are not supported by OBDeleven application. The device has unique firmware.