Digital radio, What happened? + TV question.

Several years ago I got my hands on a phone that included a digital TV and radio tuner. We lived too far away from civilization to get decent reception.
It was a cheap Chinese phone.
When I could I noticed aout three stations on the dial
Now TV in our car says it can pick unprofitable radio but nothing is found.
2nd question. How are Taiwan’s physical spectrum arranged?
In the u.s. each broadcaster has its own RF Source or Channel with that channel being divided among the smaller video services like Channel 5 a channel 5 b Etc.
But in Taiwan, each TV channel has its own number. How many real channels or sub channels are there?