Getting started
From PSP2i Wiki
Welcome to Phantasy Star Portable 2 Infinity!
This page serves as a guide to get you set up playing the game on a system of your choice, along with instructions on how to install various patches, install the downloadable content, setup multiplayer, and where to begin once you start playing the game.
Please note that currently, multiplayer is not possible consistently from a PSP or PS Vita. You may still play on these systems, but if you wish to play online with others, you will be required to transfer your savefile to another system temporarily.