> For the complete documentation index, see [llms.txt](https://guide.scamshield.gov.sg/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guide.scamshield.gov.sg/getting-started/setup-sms-filtering.md).

# Setup SMS Filtering

The ScamShield app will only filter SMSes on iOS or notify SMSes on Android when:

1. The sender ID or phone number of the message is suspected as scam by authorities. Phone numbers will only be blocked by authorities if they are deemed suspicious.
2. The message content is detected as potentially a scam by the ScamShield AI classifier.

To find out how to setup your SMS Filtering permissions, please refer to the following links:

{% content-ref url="/pages/U4lCSAifP55jVEBjONu7" %}
[Setup SMS Filtering on iOS](/getting-started/setup-sms-filtering/setup-sms-filtering-on-ios.md)
{% endcontent-ref %}

{% content-ref url="/pages/2SVCVWxHOyvwkrll4pod" %}
[Setup SMS Filtering on Android](/getting-started/setup-sms-filtering/setup-sms-filtering-on-android.md)
{% endcontent-ref %}