Read on another forum :
Phoned rogers again today, got a rather nice person at iPhone tech support who was very happy to help me out. Turns out that you do need the $10 VPN package as they applied it to my account and after changing my APN to vpn.com, using wapuser1 and wap as the user and password VPN works just fine over 3G. The salesperson I spoke to said that since I'd gotten such bad service from the CSR the other night, that he'd give me the VPN package for free (basically a $10 credit every month).
Source : http://www.howardforums.com/showthread.php/1433173-IPSEC-VPN-over-L2TP-on-3G-Edge-with-iPhone-mad/page2 ( not sure if i can add link to other forum?!?)0
Do i understand that i need a VPN package from rogers to be able to use it?
Thank you