Hi, are you recording to a multi track app or just to say memo?
If you're doing the former then you need to be able to connect the mic and headphones.
I use 4track and my headphones, you get some background noise and breathing but it's very easy and takes up no space when you're travelling away from home. I did go and by an iRig mic and a desk stand and it all worked well but have reverted to my 4s and its headphones. There are lots of others out there Blue comes to mind, I'd work out how much you want to spend, do some searches, try musicradar soundondound and I'm sure others including Boydie will be able to give a more uptodate view on what's out there.
Hope this helps :)Neil