Apple's Messages app provides an optional iOS-only mode which cuts down your cellular data consumption to a bare minimum when sending image attachments. I don't know about you, but I worry about sharing high-resolution images when cellular data is on. In my experience, most normals are oblivious to the fact that sending a single shot-on-iPhone photograph through iMessage burns through one to five megabytes of data, sometimes even more.
In low quality mode, Messages uses only 100KB per image attachment. Another way to think about it: you can send 30 to 50 images for the same amount of data required to share a full-resolution attachment in Messages. In this brief tutorial, we'll teach you how to tell Messages to send lower quality images in order to optimize your cellular data consumption and prevent unwanted overage fees.