What network does whatsapp use? A cellular network. Unless you're connected via wifi then both can do it.
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So you can't send MMS messages to someone on Android then? Is that what you're saying?
I think you are getting your platforms confused. When I'm on an Android device, I can't send iMessages to my family/friends on their iPhones. It just goes through as green bubbles (SMS/MMS). When that's the case, sharing videos or photos default to a measly 1MB in size. Have you ever watched a video that has been reduced to that file size? It ends up being the size of a postage stamp and is incredibly grainy and blurry. WhatsApp sends those same files over a data network like iMessage does. But, WhatsApp is cross platform. I can share videos from my Galaxy S8 to my brother's iPhone 6S via WhatsApp and they go through at full resolution. MMS allows group chats, etc. to work just fine with my family/friends on iPhone, it's mainly sharing media content where MMS starts showing it's ugly limitations.