If you've been having trouble connecting to the Internet on your iPhone in Singapore, it might be because your iPhone is trying to use Wireless@SG, and ironically, this is preventing you from going online.
The iPhone prefers to use WiFi instead of 3G for data connections, regardless of the strength of the WiFi signal. Whenever it can latch onto an open or authorised WiFi network, it does. Because Wireless@SG appears to be an open network, your iPhone will always connect to it. However, unless you log on via Safari first, you can't actually use Wireless@SG. This creates a situation where your iPhone thinks you have Internet access via Wi-Fi when in fact, you don't.
To force the iPhone to use 3G instead of Wi-Fi, go to Settings/Wi-Fi/ then disable Wi-Fi. This forces the iPhone to only use the 3G (or Edge) network for data.
Why wouldn't you use the free Wireless@SG account for your iPhone? Well, in my case, I only have one Wireless@SG account and I have to use it for my laptop. You can't have the same account in use by more than one device simultaneously, I've discovered. When my MacBook is using Wireless@SG, I have to use 3G for the iPhone's data connectivity.
Wireless@SG also tends to kick you off the network (at least, it does for me) and you have to log-on again repeatedly. A minor annoyance on the laptop, not so minor on the iPhone with its much more limited keyboard.
Of course, relying on the (paying) 3G network rather than a free Wi-Fi network has other obvious implications....
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