yaySIM does not provide a Thailand eSIM that includes a local phone number or SMS capability. Only data‑only eSIM plans are available for Thailand from this provider. Travelers can still use popular Voice over IP applications such as WhatsApp, Telegram, and iMessage over the data connection for calls and messaging. However, some destinations may block or restrict access to specific VoIP services, so users should verify that the apps they rely on are accessible in Thailand before purchasing.