diff --git a/extensions/sms/src/phone.test.ts b/extensions/sms/src/phone.test.ts
index d1e8f731e3a4..d70a51af2972 100644
--- a/extensions/sms/src/phone.test.ts
+++ b/extensions/sms/src/phone.test.ts
@@ -9,14 +9,18 @@ import {
 describe("SMS phone normalization", () => {
   it("normalizes sms-prefixed E.164 phone numbers", () => {
     expect(normalizeSmsPhoneNumber("sms:+1 (555) 123-4567")).toBe("+15551234567");
+    expect(normalizeSmsPhoneNumber("sms: +1 (555) 123-4567")).toBe("+15551234567");
     expect(normalizeSmsPhoneNumber("twilio-sms:+1 (555) 123-4567")).toBe("+15551234567");
+    expect(normalizeSmsPhoneNumber("twilio-sms: +1 (555) 123-4567")).toBe("+15551234567");
     expect(normalizeSmsAllowFrom("SMS:+44 20 7946 0958")).toBe("+442079460958");
+    expect(normalizeSmsAllowFrom("SMS: +44 20 7946 0958")).toBe("+442079460958");
     expect(normalizeSmsAllowFrom("*")).toBe("*");
   });
 
   it("validates E.164-ish SMS targets", () => {
     expect(looksLikeSmsPhoneNumber("+15551234567")).toBe(true);
     expect(looksLikeSmsPhoneNumber("15551234567")).toBe(true);
+    expect(looksLikeSmsPhoneNumber("sms: +1 (555) 123-4567")).toBe(true);
     expect(looksLikeSmsPhoneNumber("+01234567")).toBe(false);
     expect(looksLikeSmsPhoneNumber("+1555")).toBe(false);
   });
diff --git a/extensions/sms/src/phone.ts b/extensions/sms/src/phone.ts
index e6852cba2607..e19f099365d9 100644
--- a/extensions/sms/src/phone.ts
+++ b/extensions/sms/src/phone.ts
@@ -1,6 +1,9 @@
 // Sms plugin module implements phone behavior.
 export function normalizeSmsPhoneNumber(raw: string): string {
-  const trimmed = raw.trim().replace(/^(?:sms|twilio-sms):/i, "");
+  const trimmed = raw
+    .trim()
+    .replace(/^(?:sms|twilio-sms):/i, "")
+    .trim();
   if (!trimmed) {
     return "";
   }