hello ....everyone i am new here ...have a major problem with my iphone 2g..after a while using there is always messaging problems where msg cant send out with error that reads error sending message....need to take out the sim card and put in another phone to send out msg...then put back to iphone and is ok...for a certain time again the problem happen...really tired of doing it all over again....pls help!!!! anyone.....really appreciate it.......