in last couple days I've seen some post in internet like "I want to buy iPhone 4G" and "want to trade** black iPhone 5G to white iPhone 5G" and so on... I'm not a Apple fan but I know there are iPhone 3g, 3gs, 4, 4s, 5 - never heard about i4G and i5G. I would assume that 4G stands for 4g...