Someone said USB debugging mode needs to be active. Maybe some phones do need this but I know of at least two that work without this.I cant even get my 2018 Ignis to recognise that there is a phone plugged in with a usb cable but works ok with a iPhone. I have tried various different USB cables and nothing works.
There was a statement on the Internet somewhere that states that not all phones will connect with all cars. I can support this with various degrees of success. So far I've found Samsung and iPhone (others iPhone experiences) having greatest or should that be easiest success. Makes sense with Samsung's electronics background and Apple's software mastery. But some other phones will connect. Huawei is awkward. The ones I've tried connect and disconnect on the Suzuki but was fine on my Skoda. The BMW group of cars seem to be a particular pain with older model Minis only working with iPhones. Others no doubt have experience of many other models.
In my humble opinion Bluetooth is crap. It may be getting better, that remains to be seen.