Originally released in Japan, The I-Mode line of phones were revolutionary for their time (the phones that used I-Mode were usually more powerful than US/EU J2ME phones). Tilt sensors, 3D that actually looked decent, etc. Many major developers (Namco, Sega, and even Hudson Soft) made games for it. Unfortunately, I-Mode only took off in Japan (it had a limited release in Europe). The Struggle of porting I-Mode games to J2ME didn't help matters either. Overall, the I-Mode mobile standard is an interesting part of mobile phone history.