IPhone won't restore? Error coming up?

I was going to use my old iphone 4 for music since my 4s is full
so i reset it and it says activation request could not be completed if problem persists, please contact costumer care

i have a few problems here now
1) the lock button is broken so i can't do the home & lock at the same time to restart it method
2) i don't have warranty so i can't call costumer care
3) what do i do

Added (1). Not jailbroken, bought it straight from apple, no sim could that be the problem?

Buy a new one

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