If you meant a specific link or a different service named “3gpking,” paste the URL or clarify and I’ll summarize notable features.
I don’t have browsing results for a specific “3gpking link.” If you mean the 3gpKing site/service (a site historically used to host/stream mobile-format videos), an interesting feature was its lightweight mobile-friendly video files (3GP) that made streaming and downloading faster on low-bandwidth or older phones—much smaller file sizes and lower bitrate than standard MP4, enabling quicker playback and reduced data use.