People who want to use different PSN ids on one Vita may find it difficult to do so, as Sony has confirmed that you can use only one account per Vita. You need to format the system to be able to use different PSN ids.
“[The] PSN account is tied to the hardware and the memory card, not just the card,” a different Sony representative said in an e-mail, “which means that if a second person is using your Vita, it’s not just a case of switching out memory cards, it’s clearing out all of your saved data on the Vita itself when you do the factory reset.”
“In other words, PlayStation Vita is intended to be played by only one user,” a Sony rep said to Wired.
PSP was locked to one account as well, but you could easily switch between them without requiring a format.
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