"No Service" requires turning off and on again

Sometimes I'm somewhere where I know darn well there's a signal, but my iPhone 3G says "No Service". Turning it off and then back on again always gets me back onto the network, often with maximum strength showing.
Why does it not see the network the first time? And is there a faster way to restore service than powering it off and then back on again?

Hi Roger,
Are you using any accessories with the iPhone? If you are try testing without them.
If you haven't already update to the latest version of iPhone software, currently 2.2.1. This article: http://support.apple.com/kb/HT1414 will walk you through updating or restoring the iPhone.
If the issue persists after updating and removing the accessories, try restoring the iPhone.
-Jason

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