If you're looking for the actual novel that started the 'One Missed Call' phenomenon, it's a bit of a digital ghost hunt. The original Japanese novel 'Chakushin Ari' by Rintaro Norizuki isn't widely available in English through mainstream ebook platforms like Amazon Kindle or Kobo, at least not in an official translation. I spent ages searching and the trail always goes cold. There was an English translation published by Vertical around 2006, but it's long out of print. Your best shot is hunting for a used physical copy on sites like eBay or AbeBooks, but prices can get wild for a niche horror title.
That said, the manga adaptation by Miku Sakamoto is much easier to find digitally. You can read that on platforms like ComiXology or through Kodansha's digital manga services. It follows the novel's plot fairly closely, focusing on that eerie, escalating curse spread through voicemails. The manga art really captures the dread of those final calls. It's not the novel, but it's a solid alternative if the core story is what you're after. I ended up reading the manga first and then stumbling upon a scanned PDF of the novel translation on a forum deep dive—those kinds of fan preservation efforts are often the only way to experience these older, untranslated or out-of-print works, though the quality can be hit or miss.