Pokegear is a phone in the Johto region. In HeartGold and SoulSilver, the blue one is for the boy and the pink one is for the girl. The player gets his/her Pokegear from their in-game mother, and more functions are added to it later on by NPC characters.
Using the DS real-time clock, it can show the time on the upper screen.
This feature allows you to look at the Kanto or Johto map.
This feature allows you to tune in to radio stations, either by selecting one of the four default stations, by tapping the four four buttons on the lower screen, or searching for own by sliding inside the circle.