From the main iPhone screen select Settings

Select General

Select Network

Choose VPN

Turn VPN On

Tap L2TP and enter the following information
(*Please note: All settings are case-sensitive*):

• Description: yale wireless

• Server: vpnwindows.yale.edu

• Account: type your Yale NetID

• RSA SecurID:  OFF

• Password: type your Yale NetID password

• Secret: legacy

• Send All Traffic: ON

Tap Save

Tap On