Some comments, thanks for your contribution.

Please add a docs and recipes PR +1

Thanks for your time. I updated my code and prepared recipes and docs.

@welcoMattic you are right. We do not need to validate "from" at all. They validate ourselves. We catch this with

if (isset($responseArr['status']) && 'ok' !== $responseArr['status']) {
    throw new TransportException(sprintf("Unable to send the SMS. \n%s\n", implode("\n", $responseArr['message'])), $response);
}

@nicolas-grekas thanks. Made small changes

Do you know anyone at Sendberry that you back the bridge? Would you like to reach them about that?

I am just found them on the internet. I can try to send the link to your blog post :)
Found in my Facebook 2021-08-30, I tried to contact "Sendberry - Mobile Marketing," but response nothing.

Thank you @StaffNowa.