> 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/resources/help-center/sms-filtering/why-am-i-still-receiving-sms-from-likely-scam-sender-id.md).

# Why am I still receiving SMS from "Likely-SCAM" Sender ID?

From 31 Jan 2023, the **"Likely-SCAM"** header is used on all SMSes sent by local and foreign entities that use alphanumeric Sender IDs which are not registered with Singapore SMS Sender ID Registry (**SSIR**). IMDA's guidelines on Sender ID can be found [here.](https://www.imda.gov.sg/how-we-can-help/anti-scam-measures)\
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As the "Likely-SCAM" header in itself is a warning to the user and functions similar to a spam filter, users are advised to exercise caution when they receive such SMSes. Users should ignore SMSes with a "Likely-SCAM" Sender ID if the content of the message is not relevant to them.

{% hint style="info" %}
The ScamShield app does not filter SMSes with the "Likely-SCAM" Sender ID as they could contain legitimate information - e.g. OTPs from a foreign business which did not register its Sender ID in Singapore.
{% endhint %}