SMS gateway
How to send SMS messages (Alternative to Twilio)
In this Bubble.io tutorial we explain how to send SMS notifications from within your Bubble app. Everyone thinks of Twilio when they think of an SMS API that works with Bubble. However, I have found that ClickSend offers a much more friendly and straightforward toolkit that will have you sending SMS notifications to your app's users far quicker than if you where using Twilio.