So I've noticed something, which probably isn't new to any of you but it got me thinking.. If someone sends me a video through iMessage the quality is crisp if I'm on wifi at the time it comes through. It looks pretty bad if I'm on LTE. I get that Apple is considering my data usage and I fully understand why they do that (I have no issues with that). What I'm wondering is HOW they do this if messages, and I'm assuming attachments, are encrypted end-to-end? I don't see how they could change the compression of the video if they're not able to even see what the stream contains. On a side note, it would be nice if it were possible to get the proper quality once back on wifi!