I bet it'd take a while. The initial sync for someone with a large library is big, but just turning on upload for new pictures is only a few megabytes a day. De

I bet it'd take a while. The initial sync for someone with a large library is big, but just turning on upload for new pictures is only a few megabytes a day. Depending on how many pictures you take, of course. And if you're caught, an anodyne "a bug in iCloud Photo sync was causing increased data usage" statement and note in the next iOS patch notes would have you covered. And that's assuming they weren't actively hiding anything by e.g. splitting them up into chunks that could be slipped into legitimate traffic with Apple's servers.