rui no onna
Contributor
Here in the UK the android/iphone ratio is seemingly more balanced so everyone uses whatsapp.
I believe it's also roughly 50/50 in the US (with one platform gaining the advantage at different times).
RCS support is nice but still not universal at the moment. I have some group chats with Android users that have been upgraded to RCS but there are still some groups that are on SMS.
Most plans included unlimited messaging (SMS & MMS) though so people on both Android and iOS just use the default messaging apps. If people had to pay $0.50/message like in the old days and how in the US we get charged for both incoming and outgoing messages, I reckon folks would be more inclined to use 3rd party messaging apps like WhatsApp.