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Could you explain why? I don't own one and never really read much about Iphones.

The "holding" problem is only related to the 3G signal.

WiFi has a completely separate antenna which is unaffected

When you're on wifi you have no indication of the signal strength of any other data source (3G, Edge or GPRS).

It's possible the Wifi would go out and then the bars would drop, I suppose. Any signal issues I've seen have been non-wifi though.

You do. The signal strength bars are to the left of the carrier name, while the connection type (EDGE, 3G, WiFi) icon is the right.

The WiFi icon (which acts as a signal strength indicator for WiFi connections) unfortunately does hide the cellular data indicator, which shows whether you're connected to EDGE or 3G.

What I mean is you could have full voice signal with no data signal and not know it if you are connected to wifi too. Most areas have at least GPRS, but you can still find some towers that are voice only. Because of this you really don't have an indication of your cellular data. You can assume you have it, which is true most of the time, but you can't know for sure.

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