Not my oldest code but probably my currently most used code is this patch on Android Cyanogenmod (http://review.cyanogenmod.org/#/c/26167/) to download automatically MMS without switching the mobile data on. I made it to ICS, ported to 2.3 and it has been ported at least to Jellybean.
I had to do it because my mobile operator used to send unsolicited mms that kept my old android phone (ZTE Blade) in a wake lock, draining battery. I still don't have mobile data connection to this day!
I had to do it because my mobile operator used to send unsolicited mms that kept my old android phone (ZTE Blade) in a wake lock, draining battery. I still don't have mobile data connection to this day!