My 18 month old daughter uses iMessage & Facetime to talk to her relatives and me whenever she feels like. Now the non IOS family can too.
iMessage works great on my old iPhone with a lifeproof case, but we've got a few Android defectors that can't message her.
My love of tech started young, and I am all for my children building digital communication skills including photography & illustration. Since my family lives away from most of our relatives its also a great way for my daughter to get to interact with her grandparents and great grandparents.