Even though Apple is promising that up to five devices can connect to an iPhone 4 using Personal Hotspot, developers in Singapore are reporting that three is the current maximum.
Personal Hotspot is a new feature for the iPhone 4 that is part of the upcoming iOS 4.3 which allows users to turn their device into a WiFi hotspot. This will allow users with laptops and iPads to piggyback off the iPhone 4's Internet connection.
According to Apple Singapore's page on iOS "You can share your connection with up to five devices at once over Wi-Fi, Bluetooth and USB -- with up to three of those connections using Wi-Fi." A footnote clarifies that it will work with "up to three devices over Wi-Fi, three devices over Bluetooth and one device over USB".
However, developers in Singapore who are now running the latest version beta version of iOS 4.3 have reported that they have not been able to connect more than three devices to the iPhone 4. Once three devices are connected, attempting to connect a fourth device requires disconnecting one of the three.
The footnote limiting the Wi-Fi connectivity to three devices is found in similar pages for other countries such as the US and Australia. However, in a number of major markets in Europe such as the UK, France and Germany, there is no such limitation.
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works with up to three devices over Wi-Fi, three devices over Bluetooth and one device over USB.