Link Garmin watch to multiple phones?

Wanting to make use of the Live tracking feature on the Garmin, but the work phone that my other half has has a tendency to try and unlock itself when being carried in any kind of running belt, and then after the unlock attempts obviously fail the phones security setup decides to perform a factory reset and wipes everything. Thinking of therefore getting a basic secondary phone that can be setup without the annoying corporate security settings on it and using that for linking with the watch for doing Live tracking during runs.

However, would the watch still be able to connect to the main phone for regular use such as message/ email/ call alerts? The spare phone would be switched off or out of range when not being used for running.

Working for a phone company so getting a spare handset/ contract/ payg phone isn't an issue, working around the corporate security that then causes a self destruct on the handset is. Can it be done, or is there a different avenue I should be thinking of?