Default Sending MMS without mobile data enabled?

This may have been been asked before and I'm sorry if it has. I did do a search (including google) and nothing came up. My issue is that I've noticed I have to manually enable mobile date before any MMS message will send. On my previous phone (HTC Rezound), my mobile data would automatically turn on to send the message, then turn itself back off. Is this common to this phone, or is there something weird going on with mine? Any ideas?
LG G2
Stock rooted
HTC Rezound (backup phone / toy)
íRezone Redux!
Funky Kernel
Nexus 7 (2013)
Stock rooted
Bulletproof kernel