Using GT-I9300, JB 4.1.2.
I can't seem to find details on how "Restricting background data" works (with Mobile Data enabled) exactly.
What is considered "background" data? E.g., if I'm sending an MMS and the phone goes to sleep, will the MMS be sent? If I'm sending an MMS and press the Home button, will the MMS be sent? Do I need to have the Messaging app open all the time for it to be sent? Is it okay, if I'm looking at the settings of the said app?
I've asked questions pertaining to MMS, but I'm also wondering about the general case.