# Can I use ScamShield if I have an overseas phone number?

ScamShield is currently only effective for local Singaporean phone numbers. If you are using a foreign telco in Singapore, call blocking and SMS filtering may not work for you as foreign sender IDs are not registered by [IMDA](https://www.sgnic.sg/smsregistry/overview). We recommend using a local telecommunication provider and enabling your call blocking & SMS filtering permissions for optimum usage of the app.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://guide.scamshield.gov.sg/resources/help-center/about-scamshield/can-i-use-scamshield-if-i-have-an-overseas-phone-number.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.