Perhaps the user is referring to a tune that was popular as a ringtone on portable devices like the "Saga M" phone. The "Saga M6" is a Chinese phone. Maybe it had a preinstalled ringtone called "Falling in Love". I could search for "Saga M6 ringtone falling in love". are all in Chinese. No ringtone info.
While full-length tracks like "Sagar Kinare" and "Chehra Hai Ya Chand Khila Hai" dominated the radio waves, it was the short, ethereal romantic background cue—characterized by its signature "Lala La Lalaa" vocal track—that captured the abstract feeling of falling in love. Musical Characteristics of the Tune lala la lalaa falling in love tune from sagar m portable
Without a copy of the exact .mid or .mp3 file, the original artist remains anonymous—a ghost in the machine. Perhaps the user is referring to a tune
Many listeners associate the "la la la" vocables with the hit song "Saagar Jaisi Aankhon Wali" by Kishore Kumar, though the instrumental theme itself is often what people are searching for as a standalone "portable" tune. I could search for "Saga M6 ringtone falling in love"