yaySIM does not offer an eSIM plan for Guyana that includes a local phone number or SMS capability. The only plans available are data‑only options, with no inbound or outbound voice or text services provided by the carrier.
Travelers can still use VoIP applications such as WhatsApp, Telegram, or iMessage over the data connection to make calls or send messages. However, availability of these services can vary in different regions, so it is advisable to check that the apps you rely on are accessible in Guyana before purchasing a plan.