Why is Mobile Networks setting grayed out?

[barry_g]

All of a sudden I can't turn on my 3G data. When I go to Settings - Wireless & networks, the Mobile Networks link is grayed out/disabled. I know I have plenty of data left this month. Any help is greatly appreciated.

 

[barry_g]

Sorry - Airplane mode somehow got turned on. All better now. I would have deleted the OP, but I don't see a delete post capability on this forum.