I normally don't bother to change my phone as long as it meets my demands. Sometimes if the problem doesn't cause some extra stress to me, I just leave it alone.

As I am getting kind help from you guys here, I am turning greedy and bring another question:
why my text message shows the different time than actual time?
When I open conversations program, all the conversation shows the right time. but when I go to the details, the time is 4 hours late than the right time which shows before.
For example: my latest conversation shows 04/13/2010 16:18 which is right.
then I click this conversation, the details show me the last message was 04/13/2010 12:15
Many Thanks!

i think one time is when the message was written and the other when it was recieved on your phone. my phone shows both times when i go into detail.

the problem is there is a four hours difference.

it could be problems with the other person's phone sending the wrong time or the server having an incorrect time (not sure who sets the creation time). to test it further, try disabling your gsm by going into offline mode. have someone message you then check the time difference when you go on normal mode again.