Hi there. I used the prepaid plan for 6 months with galaxy note 2. But 2 days ago, it didn't work. And fortunately I can get the used phone from my friend. But I need different size of usim card so I bought it today. And through the self service, I clicked the usim card change and inserted new #. However, when I inserted new one to the used phone, it cannot work. It says just urgent calling is available, and I cannot call or text. My used phone is unlocked surely. When my friend's usim card is inserted with fido prepaid, the phone is worked. I have already turn off and on again and again..but still doesn't work. please help me..