Birthday Wishes For Boyfriend I Want To Send Birthday Wishes To My 5000 Clients On Their Mobile As SMS. Is There Any Way?

I want to send birthday wishes to my 5000 clients on their mobile as SMS. Is there any way? - birthday wishes for boyfriend

I am a banker and I have some strange 5000 customers. In the context of strengthening relations with them, I intend to send birthday greetings as SMS. Is there a software to send the message automatically on the anniversary?