I have two phones, each serving a role as defined in Call Handling. As needed, if any phone needs to be upgraded, they will replace the respective phone. This is to keep my life as simple and efficient as possible.
The first phone is a VTech DECT phone which is no longer in service. This is because I use Google Fi as my only phone number. Because of this, the SIP features of Google Voice with my phone number will not work. I will keep this phone nonetheless in case it will need to go into service in the future.
The second is a Google Pixel 3a XL. This is a basic cellular phone with only one SIM slot, and 64GB of storage. This phone does support all carriers in the US, and I use my Google Fi service on this phone.