Da Domande frequenti sul flusso di foto di Apple :
How long are My Photo Stream photos stored in iCloud?
The photos you upload to My Photo Stream are stored in iCloud for 30 days to give your devices plenty of time to connect and download them.
How many photos are stored in My Photo Stream on my devices and computers?
iCloud pushes all your photos to the My Photo Stream album on your devices and computers, and manages them efficiently, so you don’t run out of storage space.
Your iOS devices keep a rolling collection of your last 1000 photos in the My Photo Stream album. From there, you can browse your recent photos or move the ones you like to your Camera Roll or another album to keep them on your device forever.
Quindi, dovrai sincronizzarli da iPhoto usando iTunes, poiché Apple conserva solo le tue foto per 30 giorni sui loro server.
Potresti trovare un'altra app sull'App Store come Documenti per lettura e copiare le foto sul telefono tramite Wi-Fi (ignorando iTunes come desiderato), ma mi rendo conto che è tutt'altro che ideale.