diff --git a/src/components/InterviwerForm.tsx b/src/components/InterviwerForm.tsx
index 18a15b4..cfb2613 100644
--- a/src/components/InterviwerForm.tsx
+++ b/src/components/InterviwerForm.tsx
@@ -49,7 +49,7 @@ type FormState = {
     name: string;
     email: string;
     sid: string;
-
+    phone: string;
     availableDays: string[];
 
     responses: Record<
@@ -63,6 +63,7 @@ const initialForm: FormState = {
     email: "",
     sid: "",
     availableDays: [],
+    phone:"",
     responses:
         createEmptyResponses(),
 };
@@ -201,6 +202,9 @@ export default function InterviewerForm() {
             const sid =
                 form.sid.trim();
 
+            const phone = 
+                    form.phone.trim();
+
             const availableDays =
                 form.availableDays;
 
@@ -212,6 +216,7 @@ export default function InterviewerForm() {
                 !name ||
                 !email ||
                 !sid ||
+                !phone||
                 availableDays.length ===
                     0
             ) {
@@ -253,6 +258,17 @@ export default function InterviewerForm() {
 
                 return;
             }
+             if (
+                !/^\d{10}$/.test(
+                    phone
+                )
+            ) {
+                setError(
+                    "phone number is invalid."
+                );
+
+                return;
+            }
 
             /*
              * Check questions
@@ -313,6 +329,7 @@ export default function InterviewerForm() {
                         name,
                         sid,
                         email,
+                        phone,
                         availableDays,
                         trimmedResponses
                     );
@@ -362,6 +379,11 @@ export default function InterviewerForm() {
                             .applicant
                             .sid ||
                         "",
+                    phone:
+                        result
+                            .applicant
+                            .phone ||
+                        "",
 
                     availableDays:
                         result
@@ -416,6 +438,9 @@ export default function InterviewerForm() {
             const sid =
                 form.sid.trim();
 
+            const phone =
+                form.phone.trim();
+
             const availableDays =
                 form.availableDays;
 
@@ -427,6 +452,7 @@ export default function InterviewerForm() {
                 !name ||
                 !email ||
                 !sid ||
+                !phone ||
                 availableDays.length ===
                     0
             ) {
@@ -469,6 +495,22 @@ export default function InterviewerForm() {
                 return;
             }
 
+            /*
+             * Phone validation
+             */
+
+            if (
+                !/^\d{10}$/.test(
+                    phone
+                )
+            ) {
+                setError(
+                    "phone number is invalid."
+                );
+
+                return;
+            }
+
             setSavingPersonalInfo(
                 true
             );
@@ -480,6 +522,7 @@ export default function InterviewerForm() {
                         name,
                         email,
                         sid,
+                        phone,
                         availableDays
                     );
 
@@ -530,6 +573,12 @@ export default function InterviewerForm() {
                                 .applicant
                                 .sid,
 
+                        phone:
+                            result
+                                .applicant
+                                .phone ||
+                            "",
+
                         availableDays:
                             result
                                 .applicant
@@ -711,6 +760,43 @@ export default function InterviewerForm() {
                                     className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm outline-none disabled:cursor-not-allowed disabled:opacity-60"
                                 />
                             </div>
+
+                            <div className="space-y-2">
+                                <label
+                                    htmlFor="existing-phone"
+                                    className="text-sm font-medium"
+                                >
+                                    Phone
+                                </label>
+
+                                <input
+                                    id="existing-phone"
+                                    type="tel"
+                                    inputMode="numeric"
+                                    maxLength={
+                                        10
+                                    }
+                                    value={
+                                        form.phone
+                                    }
+                                    disabled={
+                                        !canEdit
+                                    }
+                                    onChange={(
+                                        event
+                                    ) =>
+                                        updateField(
+                                            "phone",
+                                            event.target.value.replace(
+                                                /\D/g,
+                                                ""
+                                            )
+                                        )
+                                    }
+                                    placeholder="10-digit phone number"
+                                    className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm outline-none disabled:cursor-not-allowed disabled:opacity-60"
+                                />
+                            </div>
                         </div>
 
                         {/* Available days */}
@@ -961,6 +1047,40 @@ export default function InterviewerForm() {
                                 className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm outline-none"
                             />
                         </div>
+
+                        <div className="space-y-2">
+                            <label
+                                htmlFor="phone"
+                                className="text-sm font-medium"
+                            >
+                                Phone
+                            </label>
+
+                            <input
+                                id="phone"
+                                type="tel"
+                                inputMode="numeric"
+                                maxLength={
+                                    10
+                                }
+                                value={
+                                    form.phone
+                                }
+                                onChange={(
+                                    event
+                                ) =>
+                                    updateField(
+                                        "phone",
+                                        event.target.value.replace(
+                                            /\D/g,
+                                            ""
+                                        )
+                                    )
+                                }
+                                placeholder="10-digit phone number"
+                                className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm outline-none"
+                            />
+                        </div>
                     </div>
 
                     {/* Available days */}
diff --git a/src/lib/supabase/actions/interviewers.actions.ts b/src/lib/supabase/actions/interviewers.actions.ts
index f88d2ce..c76a150 100644
--- a/src/lib/supabase/actions/interviewers.actions.ts
+++ b/src/lib/supabase/actions/interviewers.actions.ts
@@ -54,13 +54,13 @@ const appsScriptRequest =
         if (isServer) {
             const appsScriptUrl =
                 process.env
-                    .GOOGLE_APPS_SCRIPT_URL;
+                    .INT_GOOGLE_APPS_SCRIPT_URL;
 
             if (
                 !appsScriptUrl
             ) {
                 throw new Error(
-                    "GOOGLE_APPS_SCRIPT_URL is not configured."
+                    "INT_GOOGLE_APPS_SCRIPT_URL is not configured."
                 );
             }
 
@@ -159,6 +159,10 @@ const mapInterviewer =
                 String(
                     item.sid || ""
                 ),
+            phone:
+                String(
+                    item.phone || ""
+                ),
 
             availableDays:
                 Array.isArray(
@@ -255,6 +259,7 @@ export const createInterviewer =
         name: string,
         sid: string,
         email: string,
+        phone: string,
         availableDays: string[],
         responses: Record<
             string,
@@ -279,6 +284,9 @@ export const createInterviewer =
                         email:
                             email.trim(),
 
+                        phone:
+                            phone.trim(),
+
                         availableDays:
                             availableDays,
 
@@ -373,6 +381,7 @@ export const updateInterviewerPersonalInfo =
         name: string,
         email: string,
         sid: string,
+        phone: string, 
         availableDays: string[]
     ): Promise<
         UpdateInterviewerResult
@@ -395,6 +404,9 @@ export const updateInterviewerPersonalInfo =
                         sid:
                             sid.trim(),
 
+                        phone:
+                            phone.trim(),
+
                         availableDays:
                             availableDays,
                     }
diff --git a/src/pages/api/interviewer.ts b/src/pages/api/interviewer.ts
index 6e05dce..08f67e4 100644
--- a/src/pages/api/interviewer.ts
+++ b/src/pages/api/interviewer.ts
@@ -9,7 +9,7 @@ export default async function handler(
   }
 
   try {
-    const scriptUrl = process.env.GOOGLE_APPS_SCRIPT_URL;
+    const scriptUrl = process.env.INT_GOOGLE_APPS_SCRIPT_URL;
 
     if (!scriptUrl) {
       console.error("Missing GOOGLE_APPS_SCRIPT_URL in environment");
diff --git a/src/types/index.d.ts b/src/types/index.d.ts
index 2ac05d2..212b95a 100644
--- a/src/types/index.d.ts
+++ b/src/types/index.d.ts
@@ -192,6 +192,7 @@ export type InterviewerType = {
     name: string;
     email: string;
     sid: string;
+    phone: string;
     availableDays: string[];
     responses: Record<string, string>;
     status: