I've never really understood what people mean by this. For me, iMessage is indistinguishable from SMS, except for the color of the messages, and the fact that I can use iMessage over WiFi.
Using it over WiFi is big feature alone for a lot of people who are often in spaces with good WiFi but poor cellular reception. Some carriers support SMS over WiFi in the same way they do "WiFi calling" which can alleviate that.
The other major feature I see for other messengers over SMS/MMS is much larger attachment sizes. It can be challenging sending an MMS with attachments >1MB. Meanwhile, I can send a 100MB file/video or an 8MB photo over Signal. WhatsApp allows for 16MB attachments. Sending a quick video in-line with the chat thread in MMS is miserable and gives an incredibly trash quality video while most other chat apps you can stick a decent quality 30 seconds or so video without any issue. Photos sent over MMS are usually junk while one could get a decent 4x6+ print off an 8MB photo.
If I send an SMS message to a group of people, they all see a message from me. They don't know who else got it. And if they reply, they reply only to me. Is your experience different?
WhatsApp (and I think iMessage) allow me to create a group with a name/purpose and send messages to the group and receive replies to the whole group.
(P.S. I went from dumb-phones to Android and have limited exposure to iMessage's feature-set).
I imagine your experience of sending a message to multiple people and it not making a "group message" was your older dumb phones weren't switching to MMS, it was keeping it as pure SMS. In the SMS world, there is one recipient. In MMS, it's like an email, you can list a lot (100+ in some cases) of receipts and they can all see the list.
Just checked my provider's pricing ( in the UK) MMS are capped at 300kB and cost 30p (0.39 USD) per message.
That kind of pricing made WhatsApp an infinitely preferable alternative.
Phones automatically switching to MMS would be catastrophic.
Data (WhatsApp) is essentially free in comparison. £10 (13 USD) per month gets you 20GB: which doesn't care how many messages/recipients/photos you send.
Dang, that's some highway robbery pricing right there.
Here in the US its common to have at least 1MB MMS max size. Back in the day 300-600KB was often the max size, but that's definitely changed over the years. Maybe its just splitting it up and re-assembling it behind the scenes, I'm not sure.
I can't speak for all history, but from about 2004 or so in the US MMS and SMS were often bundled and billed the same, especially for networks which had rolled out 3G/EV-DO. Having a plan with 500 messages usually meant 500 combined SMS and MMS message.
> If I send an SMS message to a group of people, they all see a message from me. They don't know who else got it. And if they reply, they reply only to me. Is your experience different?
Interesting. Here in the US, plans that don't include unlimited talk+text are hard to find, even among the budget MVNOs, and that's been the case for at least a decade.
It's easy for me to forget how different my circumstances are from most other people. I'm far more likely to be in a place where I have no WiFi than a place where I have no cell service. And I don't personally know anyone outside the US, so I don't send international messages. I guess I've never paid enough attention to the fidelity of pictures I'm sent or am sending over SMS to notice a quality difference.
The other major feature I see for other messengers over SMS/MMS is much larger attachment sizes. It can be challenging sending an MMS with attachments >1MB. Meanwhile, I can send a 100MB file/video or an 8MB photo over Signal. WhatsApp allows for 16MB attachments. Sending a quick video in-line with the chat thread in MMS is miserable and gives an incredibly trash quality video while most other chat apps you can stick a decent quality 30 seconds or so video without any issue. Photos sent over MMS are usually junk while one could get a decent 4x6+ print off an 8MB photo.