Edit in JSFiddle

//extend Backbone.Model and setup a Contact model class/constrcutor
var Contact = Backbone.Model.extend({
    defaults: {
        firstName: null,
        lastName: null,
        phone: null
    },
    getName: function () {
        return this.get('firstName') + ' ' + this.get('lastName');
    }
});

/*create a contacts collection, tell it which model is used for the collection, seed it with one contact model*/
var contacts = new Backbone.Collection({ //seed it with some data
    firstName: 'Jane',
    lastName: 'Doe',
    phone: '111-111-1111'
}, {
    model: Contact
});

//create a AddContactsView class, then create instance
var AddContactsView = Backbone.View.extend({
    el: 'fieldset',
    events: {
        'click button': 'addContact'
    },
    addContact: function () {
        var firstName = this.$('#firstName').val();
        var lastName = this.$('#lastName').val();
        var phone = this.$('#phone').val();
        if (firstName && lastName && phone) {
            contacts.add({ //this will invoke the Backbone internal 'add' event
                firstName: firstName,
                lastName: lastName,
                phone: phone
            });
            this.$('input').val('');
        }
    }
});
var addContactsViewInstance = new AddContactsView();

//create ContactListView class, then create instance
var ContactListView = Backbone.View.extend({
    el: '#contacts',
    events: {
        'click li button': 'removeContact'
    },
    initialize: function () {
        this.render(); //render list
        this.listenTo(contacts, 'add remove', this.render); //the magic
    },
    removeContact: function (e) {
        $(e.target).parent('li').remove();
        contacts.findWhere({
            firstName: $(e.target).parent('li').find('span').text().split(' ')[0].trim(),
            lastName: $(e.target).parent('li').find('span').text().split(' ')[1].trim()
        }).destroy(); //this will invoke the internal 'remove' event
    },
    render: function () {
        if (contacts.length > 0) {
            this.$el.empty();
            contacts.each(function (contact) {
                this.$el.append('<li><span>' + contact.getName() + '</span>'+' / '+ contact.get('phone') + '<button type="button" class="btn-xs btn-danger removeContactBtn">X</button></li>');
            }, this);
        }
    }
});
var contactListViewInstance = new ContactListView();

body {
    margin:10px;
}

.removeContactBtn{
    margin-left:10px;
}

#contacts {
    margin-bottom:0px;
}

#contacts li{
    margin-bottom:10px;
    margin-left:10px;
    display: inline-block;
}

#contacts li:last-child{
    margin-bottom:0px;
}

.form-inline .form-group {
display: inline-block;
margin-bottom: 0;
vertical-align: middle;
}

<small>read: <a href="http://tech.pro/tutorial/1476/part-2-backbonejs-deconstructed">Part 2: Backbone.js Deconstructed</a></small>
<h4>Contact List:</h4>

<div class="panel panel-default">
    <div class="panel-body">
        <ul id="contacts" class="list-unstyled"></ul>
    </div>
</div>

<h4>Add Contact:</h4>

<fieldset class="form-inline" role="form">
    <div class="form-group">
        <input type="text" class="form-control" id="firstName" value="John" placeholder="First Name" style="width:120px;" />
    </div>
    <div class="form-group">
        <input type="text" class="form-control" id="lastName" value="Doe" placeholder="Last Name" style="width:120px;" />
    </div>
    <div class="form-group">
        <input type="tel" class="form-control" id="phone" value="000-000-0000" placeholder="Phone #" style="width:120px;" />
    </div>
    <br>
        <br>
    <button class="btn btn-primary btn-sm">Add</button>
</fieldset>
<hr /> <small>Disclaimer: This code is for learning about a model, collection, and view. Parts of it are pretty ugly and not optimized. Don't worry about it, just worry about grokking the Backbone.js parts which are contrived to create a stepping stone and thus written to this end.</small>
    </div>