ByteSIM does not offer any eSIM plans for Malaysia that include a local phone number or SMS capability. Travelers looking for phone number or outbound SMS options will have to rely on data‑only plans. Over the available data connection, popular VoIP applications such as WhatsApp, Telegram and iMessage can typically be used to make voice calls and send messages, although some destinations may block or restrict certain apps, so it is advisable to confirm the accessibility of those services in Malaysia before purchasing.