Like email providers, mobile carriers use advanced filtering systems to protect their subscribers from unsolicited spam messages. If you've found that many of your messages are not being delivered to your recipients, it's possible that your message, or your phone number as a whole, is being blocked by mobile carriers.


Here are a few questions that may help you identify and correct the issue:

  • Have you completed the carrier registration process for your MojoTxt number?

If not, carrier spam filters are much more likely to block or filter your messages. Please complete the carrier registration process right away to improve message deliverability.


  • Did you send messages to people who didn't specifically opt in?

If so, they may have reported your messages as spam. Carriers take these reports very seriously and may block your number if they receive multiple complaints. Only send messages to people who have explicitly agreed to receive text messages from you. When sending the first message to a new contact, include opt-out instructions such as "Reply STOP to unsubscribe or HELP for help." This lets recipients know how to stop receiving messages and helps demonstrate compliance with carrier requirements. If you regularly communicate with the same recipients, you do not need to include opt-out instructions in every message. However, recipients must always be able to opt out by replying STOP.

  • Does your message clearly identify who you are?

Recipients should immediately recognize who is contacting them. Messages that do not clearly identify the sender are more likely to be reported as spam or filtered by carriers. Including your business or organization name in your messages is highly recommended and is required when contacting someone for the first time.

  • Did the blocked message contain a link from a public URL shortener like Bit.ly or TinyURL?

Since many spammers use public URL shorteners in their text messages, carriers sometimes block messages containing these links. Try using MojoTxt's built-in URL shortener instead.

  • Does your message contain content that may appear spammy?

Messages that contain excessive capitalization, misleading claims, repetitive promotional content, or suspicious links are more likely to be filtered by carriers.


  • Does your message contain prohibited content?

Mobile carriers prohibit certain types of messaging content and may block messages that violate their policies.

Examples of prohibited or heavily restricted content include:

  • Illegal products or services

  • Cannabis, CBD, and related products

  • Prescription medications

  • Gambling and betting services

  • Payday loans and certain financial offers

  • Get-rich-quick schemes

  • Lead generation or purchased lead lists

  • Phishing, fraud, or deceptive marketing

Even if a product or service is legal in your area, carriers may still restrict or block messages related to it.

If your messages involve regulated products or services, review carrier guidelines carefully before sending.

  • Are recipients frequently opting out or marking your messages as spam?

High opt-out rates and spam complaints can negatively affect your sending reputation and lead to carrier filtering.

Review your messaging practices and make sure you're only sending messages that recipients expect and want to receive.


If the above suggestions do not correct the issue, please reach out and we'll be happy to help investigate. When you contact us, please include the phone number of one or two people who are unable to receive your messages, along with an example of the message that was blocked.