Yes, but SMS is antiquated. iMessage, WhatsApp, Facebook Messenger, and other similar services offer some important features that are very beneficial. The first among them is that that are end-to-end encrypted. This means that no one can see the contents of the messages except the senders and recipients. For example, if Facebook wanted to see the messages, even if someone was compelling them to, like the government, or the mob kidnaps an employee or whatever, it's simply not possible.

Also, a proper digital messaging service can handle messages as robust packages of information, with a format that is extensible, not just a raw message. It would be able to better handle group messaging scenarios and threads. You can get feedback if messages have been delivered. It would be able to better handle network interruptions. It allows for fun stuff like reactions and stuff. They could build better ways to block and report spam and harmful content.

SMS wasn't designed to handle these sorts of things