Car Stereos

My 2018 Mazda 3 Touring came with a good system, including a 9-speaker Bose setup. Ima leave it be, I just need to get it recognize my phone so I can stream Pandora through it. Not sure what the issue is, and there's no Mazda dealer in town :mad:
I have the same system and issue in my 2017 mazda 6. It wants to recognize anything in the car except my phone, including a wireless speaker we brought on vaca once. It remembers my husband's phone, my old phone and the speaker that isn't in the car. If I fiddle with it long enough I can get it.
My phone is old and I think the Bluetooth connection isn't up to par.