The sending of SMS is done in plain text and after all they are data. It is technologically possible to modify the header of the data without it being noticed, since it does not include any signature.
I'm going to describe some methods of exploiting vulnerability. They are not the only ones, but perhaps the simplest and most used:
Keep in mind that sending messages through websites can be a problem since some can take advantage of it to have valid phone numbers and then send spam.
Source: Hispabyte
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