heyy does any one know how to make a fox/ bird caller? if so could you post a how-to or a tut for me plz??

and also , if i downloaded mp3s like calling ones , is it ok if i play them on my phone to attract them or not? will it work if i play them on my phone??

but also please post a how to or tut on howto make a fox or bird call

thank you,
Jake