Find my iphone app won't show my device?

So someone took my phone today and i've been trying to use the find my iphone app to find out where it is and it won't show my phone i use the same apple id as my ipod and it only show my ipod

You need to first turn it on on the device before you lose it at:
Settings > Privacy > Location Services > Find My iPhone [on, off]

Its useless after the fact.