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I have looked back through this thread and others related to sending SMS from Access. Throughout you have been asked a lot of questions, many of which have not been answered or only partly answered
Firstly, in this thread
https://www.access-programmers.co.uk/forums/showthread.php?t=301859 you talked about sending the SMS through a mobile phone connected using Bluetooth. Even if you have got that working, I would urge you to abandon that approach. Dropped connections will occur and you can almost guarantee corruption will follow.
In that same thread I recommended you read this article
https://www.access-programmers.co.uk/forums/showthread.php?t=291805&highlight=Twilio. Did you do so? Although some of that was specific to using a specific provider, most of the code was generic and easily adapted for general use.
That was my starting point. I have sent batches of up to 1500 messages at a time using similar code. It works and is very fast. Also used for sending voice messages and for logging received SMS/voice messages.
In this thread, you have been advised by both Gasman and myself to ask your API provider for additional info. They know their system. Why are you reluctant to do so?
Finally you started yet another separate thread here
https://www.access-programmers.co.uk/forums/showthread.php?t=301871. I offered to merge it but you ignored that suggestion and have had answers there since.
In summary you've had a lot of support from several people but you aren't making it easy to help you. Please respond to all questions you have been asked ...and contact your API provider.