1. Insert your Glo sim old or new to any phone and you don't need to have money on it. 2. Dial *170*12# to activate your line for free call 3. You may receive Error messages 4. You have to repeat it many times until you receive a message that your account has been credited 5. Then you are good to go call any network for free 6. Repeat the steps when you notice they are no more working.