In the early 2000s, a silent revolution took place in the Indian subcontinent. Before high-speed 4G and affordable smartphones, there was the "feature phone" and a massive appetite for Hollywood content. The bridge between these two was a specific file format: 3GP and, later, MP4.
Avengers_Endgame_Hindi_Dubbed_3gp_100MB.mp4 or Fast_Furious_7_Hindi_60MB_3gp.The Trade-off: The video quality is very low (often grainy) and the audio is compressed, which can make Hindi dubbing sound muffled. MP4 (MPEG-4 Part 14): Hollywood Hindi Dubbed Movies 3gp-mp4
While this format made Hollywood accessible, it came with significant trade-offs: Hollywood Hindi Dubbed Movies: Why the 3GP-MP4 Era
Overview
The Popularity of 3gp and MP4 Formats