That sounds suspiciously similar to how I used to download large files on a shared 2GB/month data plan. My carrier didn't count incoming MMS messages towards the quota, and conveniently didn't re-encode images sent to their subscribers via their email-to-MMS gateway. So naturally, I'd SSH into my server, download what I wanted to download, and run the bash script I wrote, which split the downloaded file into MMS-sized chunks, and prepended a 1x1 PNG image to them, and then sent them sequentially through my carrier's gateway. This worked surprisingly well, and I had a script on my phone which would extract the original file from the sequence of "photos". It may still work, but I've since gotten a less restrictive data plan.
