I've done some searching on this topic, but it's been awhile since this question has been asked/answered so looking for some updated info. What is the best way to send a text message to external cell phones. And to include some custom text and possibly an image in the text.
Any insight into this would be super appreciated.
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The best way would be to switch to emails. That comes bundled with the platform and here you will be able to include custom text along with images or anything. If you want to do it via SMS only, then it can only be achieved via APIs of third-party SMS providers.