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"For Beta Test phase 3, fundamentally we are planning to allow anyone who possesses a FINAL FANTASY XIV Account to participate in testing, so it will be possible to make contact with your friends from within the game."
So basically if u bought the game and registered it on your SE account, you will be able to play on Phase 3 and Phase 4 (open beta)
Phase 3 will be able to use your old character from 1.0 version, but data will not be saved because in phase 4 they will add all thse characters again.
Be free to test FFXIV if u have a FFXIV copy registered then!