diff --git a/src/app/components/contacts/contact-detail/contact-detail.component.html b/src/app/components/contacts/contact-detail/contact-detail.component.html
index a1fc9fe..5a8c6d9 100644
--- a/src/app/components/contacts/contact-detail/contact-detail.component.html
+++ b/src/app/components/contacts/contact-detail/contact-detail.component.html
@@ -9,45 +9,45 @@
     </div>
     <div class="btn-back">
       <img
-        [ngClass]="{ 'd-none': !currentUserId }"
+        [ngClass]="{ 'd-none': !selectedUserId }"
         (click)="closeUserDetails()"
         src="./../../../../assets/img/arrow-left.svg"
       />
     </div>
   </div>
-  @if (currentUserId) { @for (user of checkUserData(currentUserId); track user)
-  {
+  @if (selectedUser && selectedUserId) {
   <div
     class="contact-details"
     [ngClass]="{
-      'animation-coming-in': currentUserId
+      'animation-coming-in': selectedUserId
     }"
   >
     <div class="content">
       <div
         class="circle"
         [ngStyle]="{
-          'background-color': user.color
+          'background-color': selectedUser.color
         }"
       >
-        @if(user.status) {
+        @if(selectedUser.isOnline) {
         <img src="./../../../assets/img/online.svg" alt="" />
         } @else {
         <img src="./../../../assets/img/offline.svg" alt="" />
         }
         <div class="initials">
-          {{ user.initials }}
+          {{ selectedUser.initials }}
         </div>
       </div>
       <div class="word-wrap">
         <div class="name">
-          {{ user.firstName }}
-          {{ user.lastName }}
-          @if (user.id === firebaseService.getCurrentUserId()) {
+          {{ selectedUser.firstName }}
+          {{ selectedUser.lastName }}
+          @if (currentUser && selectedUser.id === currentUser.id) {
           {{ "contacts.you" | translate }}
           }
         </div>
-        @if(user.uId === "" || user.id === firebaseService.getCurrentUserId()) {
+        @if(selectedUser.isContactOnly || currentUser && selectedUser.id ===
+        currentUser.id) {
         <div class="btns">
           <div class="btn btn-edit">
             <img src="./../../../../assets/img/contact/edit.svg" alt="" />
@@ -55,7 +55,8 @@
               {{ "contacts.btnEdit0" | translate }}
             </p>
           </div>
-          @if (user.id !== firebaseService.getCurrentUserId()) {
+          @if (selectedUser.isContactOnly || currentUser && selectedUser.id !==
+          currentUser.id) {
           <div class="btn btn-delete">
             <img src="./../../../../assets/img/contact/delete.svg" alt="" />
             <p (click)="deleteContact()">
@@ -74,21 +75,21 @@
       <div class="headline">{{ "contacts.contactInfo" | translate }}</div>
       <div class="info">
         <p>{{ "contacts.contactEmail" | translate }}</p>
-        <a [href]="'mail:' + user.email">
-          {{ user.email }}
+        <a [href]="'mail:' + selectedUser.email">
+          {{ selectedUser.email }}
         </a>
         <p>{{ "contacts.contactPhone" | translate }}</p>
-        @if(user.phone === '') {
+        @if(selectedUser.phone === '') {
         <span>{{ "contacts.contactPhoneTxT" | translate }}</span> } @else {
-        <a [href]="'tel:' + user.phone">
-          <span>{{ user.phone }}</span>
+        <a [href]="'tel:' + selectedUser.phone">
+          <span>{{ selectedUser.phone }}</span>
         </a>
-        } @if(user.uId !== "") {
+        } @if(selectedUser.uId !== "") {
         <p>{{ "contacts.contactLastOnline" | translate }}</p>
-        @if(user.status) {
+        @if(selectedUser.isOnline) {
         <span>{{ "contacts.contactLastOnlineTxt" | translate }}</span>
         } @else {
-        <span>{{ convertTimestamp(user.lastLogin) }}</span>
+        <span>{{ convertTimestamp(selectedUser.lastLogin) }}</span>
         } }
       </div>
     </div>
@@ -98,5 +99,5 @@
     [deleteContact]="deleteContact"
     [openEditDialog]="openEditDialog"
   ></app-contact-nav>
-  }}
+  }
 </section>
diff --git a/src/app/components/contacts/contact-detail/contact-detail.component.ts b/src/app/components/contacts/contact-detail/contact-detail.component.ts
index ff04c74..ece327e 100644
--- a/src/app/components/contacts/contact-detail/contact-detail.component.ts
+++ b/src/app/components/contacts/contact-detail/contact-detail.component.ts
@@ -4,6 +4,7 @@ import {
   HostListener,
   Input,
   Output,
+  SimpleChanges,
 } from '@angular/core';
 import { CommonModule } from '@angular/common';
 import { Router } from '@angular/router';
@@ -12,6 +13,9 @@ import { ContactNavComponent } from '../contact-nav/contact-nav.component';
 import { FirebaseService } from '../../../services/firebase.service';
 import { LanguageService } from '../../../services/language.service';
 import { TranslateModule } from '@ngx-translate/core';
+import { UserService } from '../../../services/user.service';
+import { finalize } from 'rxjs';
+import { User } from '../../../interfaces/user.interface';
 
 @Component({
   selector: 'app-contact-detail',
@@ -21,34 +25,59 @@ import { TranslateModule } from '@ngx-translate/core';
   styleUrl: './contact-detail.component.scss',
 })
 export class ContactDetailComponent {
-  @Input() currentUserId: string | undefined;
+  @Input() selectedUserId: string | undefined;
+  @Input() currentUser: User | null = null;
   @Output() closeContactEmitter = new EventEmitter<boolean>();
 
+  isLoading: boolean = false;
+  selectedUser: User | null = null;
+
   constructor(
     private router: Router,
     public sharedService: SharedService,
     public firebaseService: FirebaseService,
+    private userService: UserService,
     private languageService: LanguageService
   ) {}
 
+  ngOnChanges(changes: SimpleChanges) {
+    if (
+      changes['selectedUserId'] !== undefined &&
+      changes['selectedUserId'].currentValue !== ''
+    ) {
+      this.loadUser();
+    } else {
+      this.selectedUser = null;
+    }
+  }
+
   /**
    * Closes the contact details view by resetting the current user id in the
    * shared service and emitting the closeContactEmitter event.
    */
   closeUserDetails() {
-    this.sharedService.currentUserId = '';
     this.closeContactEmitter.emit();
   }
 
-  /**
-   * Checks if a user with the given user id exists in the database.
-   * @param userId the id of the user
-   * @returns an array of user objects that match the given user id
-   */
-  checkUserData(userId: string) {
-    return this.firebaseService
-      .getAllUsers()
-      .filter((user) => user.id === userId);
+  loadUser(): void {
+    this.isLoading = true;
+
+    if (!this.selectedUserId) {
+      this.isLoading = false;
+      return;
+    }
+
+    this.userService
+      .getUserById(this.selectedUserId)
+      .pipe(finalize(() => (this.isLoading = false)))
+      .subscribe({
+        next: (response) => {
+          this.selectedUser = response;
+        },
+        error: (err) => {
+          console.error('Error loading the tasks:', err);
+        },
+      });
   }
 
   /**
diff --git a/src/app/components/contacts/contact-edit-new/contact-form/contact-form.component.ts b/src/app/components/contacts/contact-edit-new/contact-form/contact-form.component.ts
index 3ae68a1..ce0b9a1 100644
--- a/src/app/components/contacts/contact-edit-new/contact-form/contact-form.component.ts
+++ b/src/app/components/contacts/contact-edit-new/contact-form/contact-form.component.ts
@@ -54,7 +54,8 @@ export class ContactFormComponent implements OnInit, OnChanges {
     phone: '',
     initials: '',
     color: '',
-    status: false,
+    isContactOnly: true,
+    isOnline: false,
     lastLogin: 0,
   };
 
diff --git a/src/app/components/contacts/contacts.component.html b/src/app/components/contacts/contacts.component.html
index 533f861..138dd9d 100644
--- a/src/app/components/contacts/contacts.component.html
+++ b/src/app/components/contacts/contacts.component.html
@@ -2,7 +2,7 @@
   <div
     class="left-frame"
     [ngClass]="{
-      'd-none': !showAllUsers && sharedService.currentUserId != undefined
+      'd-none': !showAllUsers && selectedUserId != undefined
     }"
   >
     <button class="btn-new" type="submit" (click)="openNewContactDialog()">
@@ -24,7 +24,7 @@
         class="contact"
         (click)="showUserId(user.id)"
         [ngClass]="{
-          'contact-active': sharedService.currentUserId === user.id
+          'contact-active': selectedUserId === user.id
         }"
       >
         <div
@@ -33,7 +33,7 @@
             'background-color': user.color
           }"
         >
-          @if(user.status) {
+          @if(user.isOnline) {
           <img src="./../../../assets/img/online.svg" alt="" />
           } @else {
           <img src="./../../../assets/img/offline.svg" alt="" />
@@ -47,11 +47,12 @@
             <p>
               {{ user.firstName }}
             </p>
-            <span>,&nbsp;</span>
+            @if (user.lastName ) {
             <p class="last-name">
+              <span>,</span>
               {{ user.lastName }}
             </p>
-            @if (user.id === firebaseService.getCurrentUserId()) {
+            } @if (currentUser && user.id === currentUser.id ) {
             <p>&nbsp;{{ "contacts.you" | translate }}</p>
             }
           </div>
@@ -66,9 +67,10 @@
   <div class="right-frame">
     <app-contact-detail
       [ngClass]="{
-        'd-none': !showAllUsers && sharedService.currentUserId == undefined
+        'd-none': !showAllUsers && selectedUserId == undefined
       }"
-      [currentUserId]="sharedService.currentUserId"
+      [selectedUserId]="selectedUserId"
+      [currentUser]="currentUser"
       (closeContactEmitter)="closeContactEmitter()"
     ></app-contact-detail>
   </div>
diff --git a/src/app/components/contacts/contacts.component.ts b/src/app/components/contacts/contacts.component.ts
index 9544ce2..d0c810b 100644
--- a/src/app/components/contacts/contacts.component.ts
+++ b/src/app/components/contacts/contacts.component.ts
@@ -6,6 +6,9 @@ import { ContactDetailComponent } from './contact-detail/contact-detail.componen
 import { SharedService } from '../../services/shared.service';
 import { FirebaseService } from '../../services/firebase.service';
 import { TranslateModule } from '@ngx-translate/core';
+import { ApiService } from '../../services/api.service';
+import { UserService } from '../../services/user.service';
+import { finalize } from 'rxjs';
 
 @Component({
   selector: 'app-contacts',
@@ -16,13 +19,16 @@ import { TranslateModule } from '@ngx-translate/core';
 })
 export class ContactsComponent {
   allUsers: User[] = [];
+  currentUser: User | null = null;
+  selectedUserId: string | undefined;
   usersFirstLetter: string[] = [];
   usersByFirstLetter: { [key: string]: string[] } = {};
   showAllUsers: boolean = false;
+  isLoading: boolean = false;
 
   constructor(
     public firebaseService: FirebaseService,
-    private route: ActivatedRoute,
+    private userService: UserService,
     public sharedService: SharedService
   ) {}
 
@@ -31,6 +37,8 @@ export class ContactsComponent {
    */
   ngOnInit(): void {
     this.onResize();
+    this.loadAllUsers();
+    this.loadCurrentUser();
   }
 
   @HostListener('window:resize', ['$event'])
@@ -43,20 +51,42 @@ export class ContactsComponent {
    * to true.
    */
   onResize() {
-    if (window.innerWidth <= 1150 && this.sharedService.currentUserId != '') {
+    if (window.innerWidth <= 1150 && this.selectedUserId != undefined) {
       this.showAllUsers = false;
     } else {
       this.showAllUsers = true;
     }
   }
 
+  loadAllUsers(): void {
+    this.isLoading = true;
+
+    this.userService
+      .getUsers()
+      .pipe(finalize(() => (this.isLoading = false)))
+      .subscribe({
+        next: (response) => {
+          this.allUsers = response;
+        },
+        error: (err) => {
+          console.error('Error loading the tasks:', err);
+        },
+      });
+  }
+
+  loadCurrentUser(): void {
+    this.userService.getCurrentUser().subscribe((userData) => {
+      this.currentUser = userData;
+    });
+  }
+
   /**
    * Updates the shared service current user id and triggers the resize function.
    * If the parameter is not given, it resets the current user id to an empty string.
    * @param userId - the id of the user to be set as the current user id
    */
   showUserId(userId: string = '') {
-    this.sharedService.currentUserId = userId;
+    this.selectedUserId = userId;
     this.onResize();
   }
 
@@ -64,26 +94,17 @@ export class ContactsComponent {
    * Triggers the resize function to adjust UI elements based on the current state.
    */
   closeContactEmitter() {
+    this.selectedUserId = undefined;
     this.onResize();
   }
 
-  /**
-   * Returns an array of users without the guest user.
-   * @returns An array of users
-   */
-  loadAllUserWithoutGuest(): User[] {
-    return this.firebaseService
-      .getAllUsers()
-      .filter((user) => user.initials !== 'G');
-  }
-
   /**
    * Sorts the users array by the first letter of the user's initials, and filters it by the given sort letter.
    * @param sortLetter - the letter to filter the users by
    * @returns An array of users with the given sort letter
    */
   sortUsersByFirstLetter(sortLetter: string) {
-    return this.loadAllUserWithoutGuest().filter(
+    return this.allUsers.filter(
       (user) => user.initials.substring(0, 1) === sortLetter
     );
   }
@@ -97,7 +118,7 @@ export class ContactsComponent {
    * @returns An array of unique first letters
    */
   sortFirstLetter() {
-    let filterteArray = this.loadAllUserWithoutGuest().sort((a, b) =>
+    let filterteArray = this.allUsers.sort((a, b) =>
       a.firstName.localeCompare(b.firstName)
     );
     let usersFirstLetter = Array.from(
diff --git a/src/app/interfaces/user.interface.ts b/src/app/interfaces/user.interface.ts
index 8d6e809..09ebb7d 100644
--- a/src/app/interfaces/user.interface.ts
+++ b/src/app/interfaces/user.interface.ts
@@ -7,7 +7,8 @@ export interface User {
   phone: string;
   initials: string;
   color: string;
-  status: boolean;
+  isOnline: boolean;
+  isContactOnly: boolean;
   lastLogin: number;
 }
 
diff --git a/src/app/services/api.service.ts b/src/app/services/api.service.ts
index 3cfee09..aca64c4 100644
--- a/src/app/services/api.service.ts
+++ b/src/app/services/api.service.ts
@@ -60,6 +60,10 @@ export class ApiService {
 
   // ------------- USERS ------------- //
 
+  getUsers(): Observable<User[]> {
+    return this.request<User[]>('GET', `/api/users/`);
+  }
+
   getUserById(userId: string): Observable<User> {
     return this.request<User>('GET', `/api/users/${userId}/`);
   }
diff --git a/src/app/services/login.service.ts b/src/app/services/login.service.ts
index bbdfd1d..e3d373b 100644
--- a/src/app/services/login.service.ts
+++ b/src/app/services/login.service.ts
@@ -117,7 +117,8 @@ export class LoginService {
             ? registerData.lastName.charAt(0).toUpperCase() +
               registerData.lastName.slice(1)
             : '',
-          status: true,
+          isContactOnly: false,
+          isOnline: true,
           phone: '',
           initials: registerData.name
             ? registerData.firstName.slice(0, 1).toUpperCase() +
@@ -164,7 +165,8 @@ export class LoginService {
               email: user.email || 'no mail',
               firstName: firstName.charAt(0).toUpperCase() + firstName.slice(1),
               lastName: lastName.charAt(0).toUpperCase() + lastName.slice(1),
-              status: true,
+              isContactOnly: false,
+              isOnline: true,
               phone: '',
               initials: firstName.slice(0, 1) + lastName.slice(0, 1),
               color: this.sharedService.generateRandomColor(),
@@ -192,7 +194,8 @@ export class LoginService {
       email: user.email,
       firstName: user.firstName || '',
       lastName: user.lastName || '',
-      status: true,
+      isContactOnly: false,
+      isOnline: true,
       phone: '',
       initials: user.initials,
       color: user.color,
diff --git a/src/app/services/user.service.ts b/src/app/services/user.service.ts
index d8ac7e3..f006f9c 100644
--- a/src/app/services/user.service.ts
+++ b/src/app/services/user.service.ts
@@ -63,4 +63,12 @@ export class UserService {
       })
     );
   }
+
+  getUsers(): Observable<User[]> {
+    return this.apiService.getUsers();
+  }
+
+  getUserById(userId: string): Observable<User> {
+    return this.apiService.getUserById(userId);
+  }
 }