One Missed Call 2 (Chakushin ari 2) (2003)

One Missed Call 2 introduces us to Kyoko and her friend Madoka. Both women are teaching assistants at a kindergarten in the middle of Tokyo and when the pair aren't working, they seem to spend a lot of time in a Chinese restaurant where Kyoko’s boyfriend, Naoto, works. It is here that Kyoko first encounters the cursed ringtone.

Part 1
Part 2
Part 3