Recently, my Samsung Galaxy S i9000 will not let me go on FB, Twitter, or anything that requires Internet. It will also not let me download anything from the Market.
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Check the internet connectivity in status bar (top bar), if alphabet 'E' is displayed, then internet connectivity is fine otherwise contact your service provider for activating EDGE/GPRS services.
If alphabet 'E' is displayed and internet doesn't work, then turn off your mobile, take out the SIM and reinsert it after 10-12 seconds. Turn on the mobile and check. Now internet connectivity should be restored.