check your imei
most probably your imei corrupted

or pls check did you enable flight mode

What you do last before your problem happened?Got download any apps or set any setting? If suddenly happened without u even installing anything, you might want to sent to samsung sc.

if you never rooted your phone before
did you install any apps before this happen?
or else suggest send to SC

No Sim detected? Try find if IMEI is correct. If no IMEI, means you need flash back EFS

backup your phone first and try factory reset
try not to use pirated apps

did you check on here for imei #:

about phone>status>IMEI..

after root, ensure that you install ktool and make back up for your EFS image. this efs contains your phone imei details and etc..

if totally stock untouch
then send back sc is your best choice ATM

Wah... Try this.

Check your sd can find for efs backup. Check if you have it.

If worst case and can't find a way to solve it, pm me. I will guide step by step how to get it back which works for me.

If you efs back up, use wifi and download htool. Use that to restore. I might reply slow as I am going for meeting

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Added on March 22, 2012, 3:22 pm
My heavy is 3 hours battery dead. Full hd game, mp3 running and now and then browsing.

Luckily before this i backed up my /efs folder (which contains my IMEI) and i'd try a lot of method last week when my phone suddenly have no IMEI..

what u can do is to follow a tutorial from xda-dev and if i'm not mistaken its under the General Android help, title is something like "restoring IMEI" or sumthing..
Go search at xda-developers.com okay?

im lucky i got a very2 old backup of my IMEI..
after 3days of 'No Sim' and blank IMEI. i restore my IMEI using Hellcat's K-Tool..

Try to find the thread in xda-dev yah? I posted the link in the previous thread (v29) if u can find it *grin*

No use to root it now.  Just send back to sc.

if samsung center the only one i know is at penang island
near pulau tikus northem tower

It's not motherboard foulty.  Imei lost sometimes just depends on luck. Imei number is unique, if loss then the whole motherboard need to be changed. Yours is g version?

well this is electronic item
when it's been mass produce and there will be some that having problem those unlucky one will get it