> For the complete documentation index, see [llms.txt](https://eventx-hq.gitbook.io/knowledge-base/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://eventx-hq.gitbook.io/knowledge-base/outreach-channel/sms/sms-limitation-in-different-countries.md).

# SMS limitation in different countries

EventX utilizes Twilio as its SMS gateway service to send bulk SMS messages to various countries. However, there are several country-specific regulations regarding SMS compliance that impose certain restrictions.

Some of the examples are:

| Country   | Limitation                                                                                                                                                                                                                                                                                             |
| --------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| Taiwan    | URLs (especially shortened URLs) is strictly prohibited in Taiwan.                                                                                                                                                                                                                                     |
| Singapore | From 30 January 2023, all non-registered Sender IDs will be overwritten with Alphanumeric Sender ID ‘Likely-SCAM’. From 31 July 2023 all non-registered Sender IDs will be blocked.                                                                                                                    |
| UK        | SMS messages sent with non-compliant sender types to U.K. mobile operators BT and Sky will be blocked.                                                                                                                                                                                                 |
| Malaysia  | Effective July 2, 2023, any SMS message that contains unregistered URLs and phone numbers will be blocked. You must register all full-length URLs and phone numbers that will be used within the body of an SMS message to Malaysia by this date. Shortened URLs will not be allowed for registration. |

For specifics, see Twilio's official SMS guidelines.

<https://www.twilio.com/en-us/guidelines>

## Frequently Asked Questions

### Q: Which countries have the strictest SMS regulations for EventX?

**A:** Singapore requires registered Sender IDs, Taiwan prohibits URLs in SMS, Malaysia requires URL and phone number registration, and the UK blocks non-compliant sender types.

### Q: Is SMS supported for Macao mobile numbers?

**A:** No, the SMS feature is not supported for Macao mobile numbers.

### Q: Why might my SMS be blocked in certain countries?

**A:** Country-specific regulations impose restrictions on SMS content. For example, URLs and shortened links may be prohibited, and unregistered Sender IDs may be overwritten or blocked.