What SIM card size unifi have?

We have 3 SIM Card sizes namely Standard, Micro and Nano. Every mobile phone is designed to work with certain size, so it's not possible to simply swap the sizes. But fear not, unifi SIM is compatible with all the sizes (Multi-SIM), it is 3-in-1 SIM (Standard, Micro and Nano in single card), just make sure you keep the SIM adaptor for future use.