To all:
SE J230i cannot install java games. While Samsung C230 and Motorola C168 can do it.
SE J230i : 500KB total memory
Moto C168: 634 KB totol memory
Samsung C230: 700KB for mms, 600KB for images, 500KB for games.
As far as sound quality is concerned, Motorola C168 has best among others two. The maximum volume level of C168 is equal to SE K750i but with less depth some times.
Samsung C230 has 1000 phone book contacts / 200sms. (65k colour display)
Moto C168 has 600 phone book contacts / 250 sms. (4096 colour display)
SE J230i has 200 phone book contacts / 50 sms. (65k colour display)
Motorola C168 has longer battery life (1000 mAH battery) as compared to others two.
Samsung C230: 800mAH and SE J230i: 700 mAH
Samsung C230 can save 20 FM channels while others two can save only (C168=9 , J230i=10) FM channels. So if your major priority is radio quality then Motorola C168 is the best option and less costly than others two. And C168 loses only in display quality. You will only choose SE J230i, when you are the absolutely loyal warshiper of sony ericsson !!
I have used Samsung X100, X620 , X700 and SE K700i sets. And I feel more comfort using Samsung phones as these are more USER FRIENDLY than sony ericsson sets !