The 3gp format is used for mobile phones and other devices. It's a multimedia container format that can hold video, audio, and other data.
Furthermore, Salman Khan’s real-life persona—unmarried, paternalistic, running a charitable foundation for the underprivileged—resonates with the old man's view of how an elder should behave. When Salman dances to "Jeene Ke Hain Chaar Din" (There are only four days to live), the old man nodding in his chair isn't bored; he is agreeing with the philosophy.