How to Turn Off System Update

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http://forum.xda-developers.com – I have Galaxy Nexus from Bell Mobility, the SIM is a Telus SIM. When I have T Mobile SIM installed, the "System Update Available" does not show up, the Nexus has been updated to jelly Bean. When the Telus SIM is installed, "System Update Available" keeps showing up, how do I resolve the issue. If I try to install, it fails since Jelly Bean is already loaded. Any Suggestions. Thanx Dave (HowTos)