If you have an existing SEN account, this can be used on the PS3 as a valid account also. The account can be used across a number of Sony services e.g. Music Unlimited
If you need further assistance you can check our FAQ guide 'Create a new Sony Entertainment Network account' http://faq.en.playstation.com/app/ans...
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If you have any more queries, you can visit The Official PlayStation Technical Help forums for further assistance: http://community.eu.playstation.com/t...