Phone 3gs lost network connection-phone works but no internet

iPhone 3GS with latest ios4 has been working fine with solid 3g speed and internet connection.  All of a sudden the network connection was gone and I can't re-establish it.  The phone works OK and 3g speed is 4-5 bars.  Any ideas what happened and how to fix to get a network connection??

Hello Brigitte/Leon. Welcome to the Apple Discussions!
Are your AirPort Express Base Stations (AX) the older 802.11g or the newer 802.11n models? In the current network configuration, how do you have each of the AX's configured:
o To join an existing wireless network, or
o As remote base stations in a WDS with the 802.11n AirPort Extreme Base Station (AEBSn), or
o As extensions of the AEBSn's 802.11n wireless network?

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