Orange UK customers can now upload their pictures to their Twitter stream by simply sending them to 86444.
The service is run through a photo site called Snapshot which is run by Orange, and it all works pretty seemlessly too. I tried it out today and you just send your first MMS and get a SMS back which links you to a Twitter authorisation page.
After you fill in your username and password you’re ready to go. Orange send you an SMS confirmation with the link to your picture after every upload.
I know sites like TwitPic already have MMS functionality but the way it works on Orange with its SMS confirmations is quite nice.