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To set up an iPhone to access VPOP3's mail, you first of all need to configure VPOP3 to allow access by remote users (unless you will only be using the iPhone in the office, connected via WiFi to the office LAN).
These instructions apply to the iPhone, iPad and iPod Touch, and are for iOS5. Other versions of iOS should be similar On the iPhone:
For general advice on using mobile devices, see Using a mobile phone with VPOP3