HOW to decoding emoji received via SMS?

That seems to work just fine on my end:

defmodule A do
  def decode(data \\ "D83DDE00") do
    bin = Base.decode16!(data)
    :unicode.characters_to_binary(bin, {:utf16, :big}, :utf8)
  end
end

A.decode()
# "😀"

That’s strange seems I must have missed something…

I’ve not tried it, but since the input seems to be in utf16, you should probably decode the whole string, not just the emoji, to avoid any problems with other characters outside the ascii range too.

i’d check using a library to handle gsm7 instead of doing it manually, i’ve never tested it but this should help

Definitely, I’m doing that.

The challenge I have now is determining if the received string is plain text or Hex encoded special characters like my example.