Blocking Unknown Phone Numbers by Pattern on Android Devices

Unwanted calls offering loans, promotional courses, or unsolicited services have become a persistent issue for mobile users. In their efforts to expand customer bases, banks and service providers are increasingly relying on aggressive outreach — including large-scale spam calling. Additionally, fraudsters continue to develop new schemes to deceive users.

While blocking individual calls might seem like a solution, it is often time-consuming and ineffective — especially when organizations operate entire batches of similar phone numbers. To address this, users need more reliable and scalable tools to protect themselves from such disruptions.

Pattern-Based Call Blocking

NumBuster provides Android device users with a powerful feature: the ability to block not only specific phone numbers, but also entire number ranges that share a common prefix. For instance, if spam calls are consistently coming from numbers beginning with +7999, you can block that prefix entirely — eliminating the need to manually add each number to a block list.

How to Block Phone Numbers on Android

To enable this feature in the NumBuster app, go to Settings → Blocking Settings.
There, you can configure pattern-based blocking or choose to block unknown numbers that are not stored in your contacts.

When entering a number pattern, omit spaces and special characters (e.g., 7985 or 799912).

In just a few steps, you can significantly reduce the number of unwanted calls you receive.

Pattern-based blocking in NumBuster offers an efficient and proactive approach to managing unwanted calls. Whether the source is aggressive marketing or potential fraud, this feature empowers users to maintain control over their phone communications — contributing to a calmer, more secure everyday experience.