Hi Pam!
Assuming it is shot landscape (16:9) and portrait (9:16), you should be able to AMA link directly to the file for playback in Media Composer. I did a quick test last night with iPhone 5s, and the file was 1920 x 1080 @ 29.98fps… So your best quality quality wise is to create a 1080p/29.97 project which should match the frame rate and progressive nature of the file. If you were on 8.3, you would have the additional assurance of setting the source setting on the file to match project (frame for frame) making sure it stays at 29.97.
Once linked, you can transcode to ProRes internally within Avid. Anything but ProRes LT should be fine and then do an export QT “same as source”. And voila!
If all you want to do is create a .mov with a different codec, then tools like MPEG Streamclip and such will do the same thing.
Hope you’re well too! I am doing great!
Michael