To all the sifu at LYN ..pls kindly lend me ur hand..=)

iPhone Generation : 3G 8GB
Unlocked? (or Part Number): <It is imperative to fill this up; artificially unlocked iPhones (via software or hardware) do not constitute as officially unlocked. Refer to the next paragraph to determine your Part Number>
Current Firmware :04.26.08
PC/MAC :Window Xp to do the jailbreaking
Jailbreaking software : redsn0w-win0.8
Problem Encountered : while im not using the phone to make calls or sms , even the phone is slept or awake i still couldn't receive any call or sms from others. Until i use my phone to call or sms ,then ill receive all the miss called message n other ppls message. Meaning , my iphones signal like it will automaticly turned off or slept while im not using it to smsm or calls.
Steps Taken So Far : non .
Other Information/Remarks : dont know whats the problem im having ..

wads the problem im having ?
all the reply will be much appreaciated .

Leon.