Nexus S has just got the ics update, now its turn for galaxy nexus gsm version to get the ics update, previously this android 4.0.2 update was released for the LTE version of galaxy nexus, but now users are reporting that this update is also available for Galaxy Nexus GSM version.
This android 4.0.2 ics update is about 8.7 mb in size, and changes the build number to ICL53F. According the update message this update contains the important bug fixes beside several enhancements and improvements.
As of the now the official changelog of Galaxy Nexus Android 4.0.2 update is not available, but we can refer the lte version changelog and remove all LTE part to get an idea about the changes this update contain for Galaxy Nexus Gsm version
This update is provided over the air, so definitely you need to wait for the notification message, if you can wait you can check for update manually
Goto Settings >> about phone >> System updates
If the update is shown available then follow the onscreen instruction to update the phone, if the update is not shown available then please wait and try after sometime as it is common for update to rollout in batches
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