Forgotten Phones and eSIMs
A growing number of mobile phones are eSIM compatible. As a result by simply turning on a phone, and selecting the eSIM option you could make a spare phone your primary phone. When I activated my current phone I chose to use an eSIM, rather than a physical sim. Whilst this is fun it does have one draw back. If you swap phones every so often you need to shift the eSIM from one device to another with less ease than switching nano sims.