Update concepts.md

Updating UK DASID to PRASID

Author: dbasantes

articles/communication-services/concepts/sms/concepts.md

@@ -46,10 +46,12 @@ Sending SMS to any recipient requires getting a phone number. Choosing the right
 |**Calling support**|Yes| No | No |No |
 |**Provisioning time**| 5-6 weeks| 6-8 weeks  | Instant       | 4-5 weeks| 
 |**Throughput**       | 200 messages/min (can be increased upon request)| 6000 messages/ min (can be increased upon request) | 600 messages/ min (can be increased upon request)|600 messages/ min (can be increased upon request)|
-|**Supported Destinations**| United States, Canada, Puerto Rico| United States, Canada, United Kingdom   |  Austria, Denmark, Estonia, France, Germany, Ireland, Latvia, Lithuania, Netherlands, Poland, Portugal, Spain, Sweden, Switzerland, United Kingdom| Australia, Czech Republic, Finland, Italy, Norway, Slovakia, Slovenia| 
+|**Supported Destinations**| United States, Canada, Puerto Rico| United States, Canada, United Kingdom   |  Austria, Denmark, Estonia, France, Germany, Ireland, Latvia, Lithuania, Netherlands, Poland, Portugal, Spain, Sweden, Switzerland | Australia, Czech Republic, Finland, Italy, Norway, Slovakia, Slovenia, United Kingdom| 
 |**Get started**|[Get a toll-free number](../../quickstarts/telephony/get-phone-number.md)|[Get a short code](../../quickstarts/sms/apply-for-short-code.md) | [Enable dynamic alphanumeric sender ID](../../quickstarts/sms/enable-alphanumeric-sender-id.md#enable-dynamic-alphanumeric-sender-id) |[Enable preregistered alphanumeric sender ID](../../quickstarts/sms/enable-alphanumeric-sender-id.md#enable-preregistered-alphanumeric-sender-id) |
 
 \* See [Alphanumeric sender ID FAQ](./sms-faq.md#alphanumeric-sender-id) for detailed formatting requirements.
+> [!IMPORTANT]
+> Effective **April 19, 2024**, All UK alpha sender IDs now require a [registration application](https://forms.office.com/r/pK8Jhyhtd4) approval.
 
 ## Next steps