Hello there,
Yes, there is nem wallet for iphone.
Maybe you can try "shelter dao wallet app", available both for i-phone apple store and android play store.
You can also send and receive mosaic (nem based tokens) there.
Note : I am not promoting and not correlated with shelter dao. I still don't know much about Nem, so I don't know yet about it's wallet. Maybe there is another i-phone wallet available, may be.