Can I buy a phone that doesn’t use anything from Google or Apple?
Very easy. You can pick up a Nokia 105 (2017 edition) for about £15 or a dual-sim Nokia 106 (2018 edition) for about £16. These are only 2G phones but they have built-in FM radios, they can send texts, they are great for making phone calls and they are not based on Google or Apple technologies. A 3G or 4G phone would cost a bit more …