iphone, freebsd, vpn

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Hi, 

I'm looking forward how to connect from my iphone to my FreeBSD server using VPN, do you have any suggestions?
Should I use, L2TP, PPTP or IPSec? Do you have any experience with it?

Some details: my iphone always gets a new ip address from my GSM provider when I connect to the internet, my FreeBSD server connects to the internet using PPPoE connection with static IP and I want to reach it through the internet.

Thank you!
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