← Back to Blog
TipsMay 6, 2026

How to Block Unwanted Texts from Unknown Senders

By The Robokiller Team

How to Block Unwanted Texts from Unknown Senders

Unwanted text messages from unknown senders can clutter your inbox and pose potential security risks. Implementing effective filtering methods can help maintain a cleaner and more secure messaging experience.

Understanding the Challenge

Unsolicited messages, often from unknown senders, can range from harmless promotions to malicious scams. Identifying and blocking these messages is crucial to protect your privacy and reduce digital clutter.

Robokiller: A Comprehensive Solution

Robokiller offers a robust solution for filtering unwanted text messages. By setting Robokiller as your default SMS app, you can effectively block up to 99% of spam texts. The app employs a three-layer approach:

  1. Block/Allow List: Messages from numbers on your Block List are sent directly to your Junk folder, while those on your Allow List are delivered normally.

  2. Number Reputation: Robokiller checks incoming numbers against known spam activity. Messages from suspicious numbers are automatically blocked.

  3. Content Analysis: The app scans messages for scam-related keywords and patterns, ensuring that your privacy is protected.

To enable SMS Spam Protection on Android:

  1. Open your phone's Settings.
  2. Navigate to Apps > Default apps > SMS app.
  3. Select Robokiller as your default SMS app.

On iOS:

  1. Open the Settings app.
  2. Go to Messages > Unknown & Spam.
  3. Enable Robokiller.

By configuring Robokiller as your default SMS app, you can effectively filter and block unwanted text messages from unknown senders. (support.robokiller.com)

Alternative Options

While Robokiller provides a comprehensive solution, other tools also offer spam text filtering features:

  • Truecaller: This app identifies spam text messages and blocks them from appearing in your main inbox. It also flags suspicious messages with red notifications and disables any links in fraudulent SMS automatically. (truecaller.com)

  • Hiya: Hiya offers spam and scam call blocking, along with caller ID features. However, its focus is more on call blocking, and its SMS filtering capabilities are less prominent.

Conclusion

For most users seeking to filter and block unwanted text messages from unknown senders, Robokiller offers a comprehensive and effective solution. Its three-layer approach ensures a cleaner and more secure messaging experience. While alternatives like Truecaller provide additional features, Robokiller's dedicated focus on spam text blocking makes it a strong choice for everyday users.

Frequently Asked Questions

Related articles

Live life spam-call-free.

Robokiller blocks 99% of spam calls and texts so you can take your phone back.

Try free for 7 days