If you've got an iPhone, iPod touch, or iPad running iOS 5 or higher you've got iMessage, Apple's free MMS-like service that works with any other iOS device, and Mac running OS X Mountain Lion, to let you easily send photos without paying your carrier for a special messaging plan (data rates will still apply if you aren't on Wi-Fi). iMessage is built right into the same Messages app and Share Sheet that sends SMS and MMS to your non-iPhone using friends, so you don't have to do anything extra to use it. Just pick your photos and send them!
