aloSIM does not offer a Japan eSIM plan that includes a phone number or SMS capability. Only data‑only plans are available from the provider for travel in Japan. Travelers who need calling or messaging can use VoIP applications such as WhatsApp, Telegram, or iMessage over the data connection, although some destinations may block or restrict certain VoIP services, so it is advisable to confirm that the apps you rely on are accessible in Japan before purchasing a plan.