The XAML of our page

GroupingListViewSamplePage.xaml

<?xml version="1.0" encoding="utf-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:local="clr-namespace:GroupingListViewSample"
    x:Class="GroupingListViewSample.GroupingListViewSamplePage">
    
	<ListView ItemsSource="{Binding PhonesList}" IsGroupingEnabled="True" GroupDisplayBinding="{Binding Name}">
        <ListView.ItemTemplate>
            <DataTemplate>
                <TextCell Text="{Binding Title}" />
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>
</ContentPage>