diff --git a/.changeset/twelve-panthers-mix.md b/.changeset/twelve-panthers-mix.md
new file mode 100644
index 0000000..d4bdd58
--- /dev/null
+++ b/.changeset/twelve-panthers-mix.md
@@ -0,0 +1,5 @@
+---
+"@great-detail/whatsapp": patch
+---
+
+Add Phone Numbers' APIs
diff --git a/src/BusinessProfile/index.ts b/src/BusinessProfile/index.ts
index 242be39..fe4cee7 100644
--- a/src/BusinessProfile/index.ts
+++ b/src/BusinessProfile/index.ts
@@ -36,9 +36,7 @@ export default class BusinessProfile {
       ...this._request,
       method: "GET",
       searchParams: {
-        fields: Object.entries(fields ?? {})
-          .map(([key]) => key)
-          .join(","),
+        fields: Object.keys(fields ?? {}).join(","),
       },
     })<GetBusinessProfilePayload<Fields>>(
       this.getEndpoint(phoneNumberID),
diff --git a/src/Client.ts b/src/Client.ts
index 920f604..0854cbf 100644
--- a/src/Client.ts
+++ b/src/Client.ts
@@ -9,6 +9,7 @@
 import BusinessProfile from "./BusinessProfile/index.js";
 import Media from "./Media/index.js";
 import Message from "./Message/index.js";
+import PhoneNumbers from "./PhoneNumbers/index.js";
 import SubscribedApps from "./SubscribedApps/index.js";
 import Webhook from "./Webhook/index.js";
 import type { Options as KyOptions } from "ky";
@@ -23,6 +24,7 @@ export default class Client {
 
   public businessProfile: BusinessProfile;
   public message: Message;
+  public phoneNumbers: PhoneNumbers;
   public subscribedApps: SubscribedApps;
   public media: Media;
   public webhook: Webhook;
@@ -37,6 +39,7 @@ export default class Client {
 
     this.businessProfile = new BusinessProfile(this._request);
     this.message = new Message(this._request);
+    this.phoneNumbers = new PhoneNumbers(this._request);
     this.subscribedApps = new SubscribedApps(this._request);
     this.media = new Media(this._request);
     this.webhook = new Webhook();
diff --git a/src/PhoneNumbers/index.ts b/src/PhoneNumbers/index.ts
new file mode 100644
index 0000000..c028df7
--- /dev/null
+++ b/src/PhoneNumbers/index.ts
@@ -0,0 +1,70 @@
+/**
+ * WhatsApp NodeJS SDK.
+ *
+ * @author Great Detail Ltd <info@greatdetail.com>
+ * @author Dom Webber <dom.webber@hotmail.com>
+ * @see    https://greatdetail.com
+ */
+
+import ky, { Options as KyOptions } from "ky";
+import { BusinessAccountID } from "../types/BusinessAccount.js";
+import {
+  GetPhoneNumberFields,
+  GetPhoneNumberOptions,
+  GetPhoneNumberPayload,
+  ListPhoneNumbersOptions,
+  ListPhoneNumbersPaylod,
+} from "../types/PhoneNumbers/index.js";
+
+interface MethodOptions {
+  request?: KyOptions;
+}
+
+export default class PhoneNumbers {
+  constructor(protected _request: KyOptions) {}
+
+  public getEndpoint(businessAccountID: BusinessAccountID) {
+    return encodeURIComponent(businessAccountID) + "/phone_numbers";
+  }
+
+  public getPhoneNumber<Fields extends GetPhoneNumberFields = object>({
+    phoneNumberID,
+    fields,
+    request,
+  }: MethodOptions & GetPhoneNumberOptions) {
+    return ky.create({
+      ...this._request,
+      method: "GET",
+      searchParams: {
+        fields: Object.keys(fields ?? {}).join(","),
+      },
+    })<GetPhoneNumberPayload<Fields>>(
+      encodeURIComponent(phoneNumberID),
+      request,
+    );
+  }
+
+  public listPhoneNumbers({
+    businessAccountID,
+    sort,
+    filtering,
+    request,
+  }: MethodOptions & ListPhoneNumbersOptions) {
+    return ky.create({
+      ...this._request,
+      method: "GET",
+      searchParams: {
+        ...(sort
+          ? {
+              sort,
+            }
+          : {}),
+        ...(filtering
+          ? {
+              filtering,
+            }
+          : {}),
+      },
+    })<ListPhoneNumbersPaylod>(this.getEndpoint(businessAccountID), request);
+  }
+}
diff --git a/src/index.ts b/src/index.ts
index b269111..d8831e2 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -19,6 +19,8 @@ export type * from "./types/Message/MessageReferral.js";
 export type * from "./types/Message/MessageSystem.js";
 export type * from "./types/Message/MessageText.js";
 
+export type * from "./PhoneNumbers/index.js";
+
 export type * from "./types/SubscribedApps/index.js";
 
 export type * from "./types/Webhook/WebhookEventNotification.js";
diff --git a/src/types/PhoneNumbers/index.ts b/src/types/PhoneNumbers/index.ts
new file mode 100644
index 0000000..80bcc64
--- /dev/null
+++ b/src/types/PhoneNumbers/index.ts
@@ -0,0 +1,73 @@
+/**
+ * WhatsApp NodeJS SDK.
+ *
+ * @author Great Detail Ltd <info@greatdetail.com>
+ * @author Dom Webber <dom.webber@hotmail.com>
+ * @see    https://greatdetail.com
+ */
+
+import { BusinessAccountID } from "../BusinessAccount.js";
+import { PhoneNumberID } from "../PhoneNumber.js";
+
+export type ListPhoneNumbersOptions = {
+  businessAccountID: BusinessAccountID;
+  sort?: string;
+  filtering?: string;
+};
+
+export type ListPhoneNumbersPaylod = {
+  data: {
+    id: PhoneNumberID;
+    verified_name: string;
+    code_verification_status: "VERIFIED" | (string & NonNullable<unknown>);
+    display_phone_number: string;
+    quality_rating: string;
+    platform_type: string;
+    throughput: {
+      level: string;
+    };
+    last_onboarded_time?: string;
+    webhook_configuration: {
+      application?: string;
+    };
+  }[];
+};
+
+export type GetPhoneNumberFields = {
+  name_status?: boolean;
+};
+
+export type GetPhoneNumberOptions<
+  Fields extends GetPhoneNumberFields = object,
+> = {
+  phoneNumberID: PhoneNumberID;
+  fields?: Fields;
+};
+
+export type GetPhoneNumberPayload<
+  Fields extends GetPhoneNumberFields = object,
+> = {
+  id: PhoneNumberID;
+  verified_name: string;
+  name_status: Fields extends { name_status: true }
+    ?
+        | "APPROVED"
+        | "AVAILABLE_WITHOUT_REVIEW"
+        | "DECLINED"
+        | "EXPIRED"
+        | "PENDING_REVIEW"
+        | "NONE"
+        | (string & NonNullable<unknown>)
+    : undefined;
+  code_verification_status: "VERIFIED" | (string & NonNullable<unknown>);
+  display_phone_number: string;
+  quality_rating: string;
+  platform_type: string;
+  throughput: {
+    level: string;
+  };
+  last_onboarded_time?: string;
+  webhook_configuration: {
+    application?: string;
+  };
+};