diff --git a/backend/.env.example b/backend/.env.example
index 54abed1..1581b25 100644
--- a/backend/.env.example
+++ b/backend/.env.example
@@ -11,11 +11,11 @@ CH_JWT_SECRET=change-me-in-production
 CH_JWT_EXPIRY_HOURS=72
 
 # Tencent COS
-CH_COS_SECRET_ID=
-CH_COS_SECRET_KEY=
-CH_COS_REGION=ap-hongkong
-CH_COS_BUCKET=
-CH_COS_BASE_URL=
+CH_COS_SECRET_ID=AKIDUxR3TfeWDbqFQQDn9INJ1U8annY7TbWN
+CH_COS_SECRET_KEY=jJitIUTFyf5WvDPXiigS2PaaMtCJSQCn
+CH_COS_REGION=ap-guangzhou
+CH_COS_BUCKET=hku-icb-1311994147
+CH_COS_BASE_URL=https://hku-icb-1311994147.cos.ap-guangzhou.myqcloud.com
 
 # SMTP Email
 CH_SMTP_HOST=
@@ -23,7 +23,7 @@ CH_SMTP_PORT=465
 CH_SMTP_USER=
 CH_SMTP_PASSWORD=
 CH_SMTP_FROM_EMAIL=
-CH_SMTP_FROM_NAME=ClassHub
+CH_SMTP_FROM_NAME=HKU ICB
 
 # Frontend URL
 CH_FRONTEND_URL=http://localhost:3000
diff --git a/backend/app/config.py b/backend/app/config.py
index c4e8995..dca2318 100644
--- a/backend/app/config.py
+++ b/backend/app/config.py
@@ -28,7 +28,7 @@ class Settings(BaseSettings):
     smtp_user: str = ""
     smtp_password: str = ""
     smtp_from_email: str = ""
-    smtp_from_name: str = "ClassHub"
+    smtp_from_name: str = "HKU ICB"
 
     # Frontend URL
     frontend_url: str = "http://localhost:3000"
diff --git a/backend/app/db/models.py b/backend/app/db/models.py
index 9bba718..cd2ff6c 100644
--- a/backend/app/db/models.py
+++ b/backend/app/db/models.py
@@ -53,6 +53,7 @@ class User(Base):
     position: Mapped[str | None] = mapped_column(String(100), nullable=True)
     skills_tags: Mapped[str | None] = mapped_column(Text, nullable=True)  # JSON array
     wechat_id: Mapped[str | None] = mapped_column(String(100), nullable=True)
+    phone: Mapped[str | None] = mapped_column(String(20), nullable=True)
     avatar_url: Mapped[str | None] = mapped_column(Text, nullable=True)
     bio: Mapped[str | None] = mapped_column(Text, nullable=True)
 
diff --git a/backend/app/main.py b/backend/app/main.py
index 2a3907f..2ee5459 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -66,7 +66,7 @@ async def lifespan(app: FastAPI):
 
 
 app = FastAPI(
-    title="ClassHub",
+    title="HKU ICB",
     description="HKU ICB Graduate Class Resource Platform",
     version="1.0.0",
     lifespan=lifespan,
@@ -74,7 +74,7 @@ app = FastAPI(
 
 app.add_middleware(
     CORSMiddleware,
-    allow_origins=[settings.frontend_url, "http://localhost:3000"],
+    allow_origins=[settings.frontend_url, "http://localhost:3000", "http://192.168.31.172:3000"],
     allow_credentials=True,
     allow_methods=["*"],
     allow_headers=["*"],
diff --git a/backend/app/schemas/user.py b/backend/app/schemas/user.py
index 04487b1..1e13277 100644
--- a/backend/app/schemas/user.py
+++ b/backend/app/schemas/user.py
@@ -17,6 +17,7 @@ class UserOut(BaseModel):
     position: str | None
     skills_tags: list[str] | None
     wechat_id: str | None
+    phone: str | None
     avatar_url: str | None
     bio: str | None
     created_at: datetime
@@ -44,6 +45,7 @@ class UserPublic(BaseModel):
     position: str | None
     skills_tags: list[str] | None
     wechat_id: str | None
+    phone: str | None
     avatar_url: str | None
     bio: str | None
 
@@ -71,6 +73,7 @@ class UserUpdate(BaseModel):
     position: str | None = None
     skills_tags: list[str] | None = None
     wechat_id: str | None = None
+    phone: str | None = None
     bio: str | None = None
 
 
diff --git a/backend/app/services/directory_service.py b/backend/app/services/directory_service.py
index 9cafd64..6ef826a 100644
--- a/backend/app/services/directory_service.py
+++ b/backend/app/services/directory_service.py
@@ -72,6 +72,7 @@ def user_to_public(user: User, include_contact: bool = True) -> UserPublic:
         position=user.position,
         skills_tags=user.get_skills_list(),
         wechat_id=user.wechat_id if include_contact else None,
+        phone=user.phone if include_contact else None,
         avatar_url=user.avatar_url,
         bio=user.bio,
     )
diff --git a/backend/app/services/email_service.py b/backend/app/services/email_service.py
index cec043a..43b4cb4 100644
--- a/backend/app/services/email_service.py
+++ b/backend/app/services/email_service.py
@@ -42,9 +42,9 @@ async def send_registration_notification(
     html = f"""
     <h2>New Registration Pending Approval</h2>
     <p><strong>{student_name}</strong> has registered for <strong>{class_name}</strong>.</p>
-    <p>Please log in to ClassHub to review and approve.</p>
+    <p>Please log in to HKU ICB to review and approve.</p>
     """
-    await send_email(admin_email, "ClassHub: New Registration", html)
+    await send_email(admin_email, "HKU ICB: New Registration", html)
 
 
 async def send_approval_notification(student_email: str, approved: bool):
@@ -52,8 +52,8 @@ async def send_approval_notification(student_email: str, approved: bool):
     html = f"""
     <h2>Registration {status_text.capitalize()}</h2>
     <p>Your registration has been <strong>{status_text}</strong>.</p>
-    {"<p>You can now log in to ClassHub.</p>" if approved else ""}
+    {"<p>You can now log in to HKU ICB.</p>" if approved else ""}
     """
     await send_email(
-        student_email, f"ClassHub: Registration {status_text.capitalize()}", html
+        student_email, f"HKU ICB: Registration {status_text.capitalize()}", html
     )