I searched for similar topics and found none. I have an iphone 5s work phone that only has 16 gb (10 or so i can use). i'm always hovering around 2-3gb free. My concern is that the apple watch apps could fill up a lot of that free space since they have to be housed on the phone i think. If the american express phone app is 50mb and i already have it (and there was an apple watch update) - will there be additional storage requirements on the phone when i go to the apple watch store? thoughts?