Edit in JSFiddle

var contactData = [
    {firstName: 'John',lastName: 'Doe',phone: '111-111-1111'}, 
    {firstName: 'Jane',lastName: 'Doe',phone: '222-222-2222'},
];

var contacts = new Backbone.Collection(contactData,{model:Backbone.Model});
    
//loop over each model in a collection, logging its attribute values
contacts.each(function(model){
    console.log(model.values());
});
//get first model in collection, log its attribute values
console.log(contacts.first().values());