Most devices sold in Australia are compatible with Lebara Mobile SIMs. Many international devices will also work. The frequencies that Lebara use are; 4G 2100MHz, 1800MHz, 850MHz; 3G 2100MHz metro and 900 MHz metro / regional. If your phone was provided by another network it is possible that it has a network lock. If that is the case, please speak to your past provider and request to unlock.