removed dead link

Author: ramsrib

fern/chat/sms-chat.mdx

@@ -21,7 +21,7 @@ SMS chat requires a **10DLC-approved Twilio number**. Only customers can initiat
 
 * A [Vapi account](https://dashboard.vapi.ai/) with an existing assistant
 * A **10DLC-approved Twilio phone number** (required for assistant responses)
-* Basic understanding of [phone number management](/phone-numbers)
+* Basic understanding of phone number management
 
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@@ -109,7 +109,6 @@ Enhance your SMS chat implementation:
 
 * **[Chat API](/chat/quickstart)** - Understand the underlying chat technology
 * **[Session management](/chat/session-management)** - Learn how sessions work in detail
-* **[Phone number management](/phone-numbers)** - Configure advanced telephony features
 * **[Assistant configuration](/assistants/quickstart)** - Optimize your assistant for text conversations
 
 <Tip>