Unlocked, yet password-protected wifi networks render email/apps useless

Email and apps work great at home where I have a wifi connection on my home wireless router. But when out and about, unlocked (yet password protected) wifi networks (like Optonline) render apps useless. In short, email and apps are trying to connect to the wifi network (since it's unlocked). But in order to actually connect to it, you need to sign in via Safari first.
Shouldn't the iPhone be "smarter" and know that if a wifi connection is locked OR password protected, it should simply go ahead and use 3G? Otherwise, you need to manually turn off wifi and force the iPhone to use 3G.
Anyone else experience this? Any suggestions?

If you have previously connected your iPhone to such a wi-fi network - which you must do first before entering the required password via the Safari webpage before you have internet access via the wi-fi network, your iPhone will automatically connect to the wi-fi network when returning within range of the network.
If you don't want to use such a particular wi-fi network for internet access, which the provider for the network requires entering a password via a webpage before having internet access via the wi-fi network, remove the wi-fi network from your iPhone and don't join the network when returning within range of the network.
When within range of the network, which your iPhone will automatically connect to if you have previously connected to the network if wi-fi access is on, select the right facing arrow in a blue circle icon to the right of the network and at the next screen for the wi-fi network settings, select Forget this Network, and don't connect to the wi-fi network when returning within range of the network. If you want to use the wi-fi network for internet access, you must enter your password to access the internet via the wi-fi network, which requires connecting to the wi-fi network first.

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