My iphone is lost help me please !!!

My icloud is setup on my iphone 4 i recently misplaced it so im looking for it with my sons ipod who also has his icloud set up to his device when i logged in to find my iphone it told me my phone was offline so i knew it wasnt in my home so i kept trying pressing the alert buttons so just in case it surfaces in a wifi area it can be located but i think i accidently pressed erase iphone and now i log in and it says " no device" so my question is how can i locate my phone thru his ipod ? Pr what can be done at this point ?