Do i need my Iphone unlocked?

So I have an old Iphone 3 and an Iphone 4 Well my 4 is full with songs. So I was gonna take my 3 and you as an ipod. Just for songs to free up my 4. Well When I charged the 3 up it won't let me do anything unless I Activate it. I don't want to start it on a plan. I don't even need service of any kind. So is there anything I can do to get past this one thing?

Sync it to your computer.

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