Link Shortening

In the U.S., carriers restrict public URL shorteners like bitly and tinyurl to prevent abuse by spammers and scammers.

• Solution with Custom Domains: You can use bitly and tinyurl with a custom (branded) domain.
  • Bitly explains this in their support article on custom domains.
  • Example of Custom Domain: A custom domain looks like https://mycompany.com/12345, which is accepted by carriers.
• Twilio’s Link Shortening:
  • For more details, refer to Twilio's documentation on shortened URLs.

Personal Information

It's possible that using personal identifying information in your SMS messages can get flagged by carriers. Scammers often use this to connect with targets to move the conversation forward. 

Some examples of personal information:

• Name
• Address
• Birthdate

Add an Identifier

After being registered for Twilio A2P, carriers often filter messages that are not identifiable. Bottle registers your business directly, so let the recipients of your message know who's sending their way! 

Example: Hey, Bottle here! Your order is ready for pickup today!

Read more

Here is a link to best practices as provided by the CTIA (Cellular Telecommunications Industry Association)

https://www.ctia.org/the-wireless-industry/industry-commitments/messaging-interoperability-sms-mms