Hi, i am a user of the K750I and here is my review about this fantastic phone.
Functions:
This phone have almost all the function that you will ever need.It have:
Bluetooth(fast with se phone)
Infa-red
Memory stick pro duo support up to 4GB(tested and verified)
2 mega pixel(best camera for such a cheap phone)
Flash(for night photo taking)
Media player(support mp3, Mp4, aac)
Radio(for the radio lover)
Personal experience
Here is my personal experience. This phone have been with me for the past 2 mths and i have never grumble about it at all. I live in Singapore and i am still a secondary 3 student.I love having the earphone into my ears to enjoy the music.What i like about this phone is that, the sound is very clear compared to other brand like motorola and nokia. I used to ahev a moto e398(converted to E1 firmware). I used to thought that is was the best phone till i had this phone.The picture that i take with my friends are so clear that my friend all loved it.
BAd points:
My phone cant be converted to W800I firmware as it is CID49.
Overall rating is 9/10