I got problem with my network after I switch the SIM card.

I've go back to china in my summer holiday and of cause switched to a chinese SIM card. But im not able to use any software to get on the internet with it although it does show 3g on the top left coner. everthing else are working fine, i can dail, pick up phone calls, send or recieve messages, and one of online chating software which is a bit like MSN is still functioning. I've asked local shops and customer service, and tried everything they suggest like reset network, reset the whole phone and i even recovered it to its initial status, but the network still the same. The SIM card works fine and it is able to connect the internet on my friends cell phone, and i used it last summer holidy without any problem at all.
I'm guessing there might be some setup problem after i upgraded the system, I really hope someone can help me with this problem.
<Edited by Host>

Hi,
What version of the OS did you upgrade from ?
Anything before OS X 10.8.2 may have an issue if the Logic/Mother board has been replaced and the Serial Number not "flashed" back to it.
In the Apple Icon menu use the About this Mac item.
In the new panel click twice on the line that tells you the current OS level
It will change to the Build number (and alternative count to the OS versions) and then the Serial Number.
If it is missing you need to get it replaced.
(It is supposed to be done on Repair or Refurbishment).
An Apple Store or Apple Authorised Service Provider as the best choices.
There are apps you can download (They are Mac Model specific) but needs careful typing as it is a once only trip.
8:56 pm Sunday; November 24, 2013
 iMac 2.5Ghz 5i 2011 (Mavericks 10.9)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad
Message was edited by: Ralph Johns (UK)

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Hi,
What version of the OS did you upgrade from ?
Anything before OS X 10.8.2 may have an issue if the Logic/Mother board has been replaced and the Serial Number not "flashed" back to it.
In the Apple Icon menu use the About this Mac item.
In the new panel click twice on the line that tells you the current OS level
It will change to the Build number (and alternative count to the OS versions) and then the Serial Number.
If it is missing you need to get it replaced.
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There are apps you can download (They are Mac Model specific) but needs careful typing as it is a once only trip.
8:56 pm Sunday; November 24, 2013
 iMac 2.5Ghz 5i 2011 (Mavericks 10.9)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad
Message was edited by: Ralph Johns (UK)

Since 1 year after replaced my iphone from mobily my iphone need to connected with itunes every time i changed the SIM card

the problem that I have facing when change the SIM card the mobile told me please connect with iTunes even Mobily SIM's.
iPhone 3G 16G Black
Old
New
IEMI
011773008768573
011932008420730
SERIAL NUMBER
88903YM4Y7K
5K9401QZY7K
Appreciate your support to solve this issue.

Sorry to butt in again:
But your original post(s) were not so clear.
So if your original phone WAS locked and the LOCKED one got replaced from the APPLE store...then there is a 100% chance it IS locked.
Sorry, but there is no such thing as a free lunch...
Check with Apple anyways...

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I got problem with my network after I switch the SIM card.

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