Cant send sms to instapay only but can send to other numbers

If you encounter any challenges with third-party applications or a particular website, I recommend reaching out directly to the respective app developer or site publisher/host for further assistance. Here is how

• To contact an App developer --> How to contact an app developer - Apple Support
• To contact a web publisher —> Scroll Down to the bottom of the web page. You will find: Contact Us, Help Center, Support, Terms of Use etc.