This thread made me thinking of using old android phone for TR. I got my galaxy note 3(SM-N900S) which has native ANT+ support. Since it’s so old, current TR app doesn’t work properly under original OS(Android 5/lollipop). I tried to install LineageOS 18.1(Android 11) and 17.1(Android 10) but both doesn’t provide ANT Hardware permission(App’s permission section is grayed out saying no permission requested) to ANT Radio Service app. Several threads regarding this problem found(Unable to provide ANT hardware permission).
FYI those about to revive old Android devices. Looks like ANT+ support is flawed for some Android devices with recent firmware(Android 9, 10, 11).