What does the circle mean?

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Jan 20, 2010
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Ickleford, Hitchin, United Kingdom
Your Mac's Specs
PowerPC G4 533Mhz, 2010 MBP 13" Intel core 2 Duo, 4GB DDR3, 350M GPU, 250GB HDD.
what does it mean when the '3G' in the status bar thing turns into a little circle? my iPhone 4 does this occasionally, and it seems my signal jumps up when it does occur.


e.g.

it says:


and occasionally it becomes

 

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