public static void DeleteContactAsync(IStateService stateService, TLInt userId)
        {
#if WP8
            Telegram.Api.Helpers.Execute.BeginOnThreadPool(() =>
                                                           stateService.GetNotifySettingsAsync(
                                                               async settings =>
            {
                if (settings.PeopleHub)
                {
                    var store        = await ContactStore.CreateOrOpenAsync();
                    var phoneContact = await store.FindContactByRemoteIdAsync(userId.ToString());
                    await store.DeleteContactAsync(phoneContact.Id);
                }
            }));
#endif
        }