While the Pokégear has a radio function, it's not playable. It's purely an aesthetic feature, and you can't tune into different stations or listen to music.
However, you can still use your Pokégear for other functions, like:
* Checking your Pokémon's status.
* Viewing your Pokédex.
* Checking the time and date.
* Accessing the map.
* Receiving calls from other characters.
Unfortunately, the radio on the Pokégear remains just a visual element and not an interactive feature.