using System;

using System.Linq;

​

​

public class Phone

{

    public int pNumber {get; set;}

}

​

public class Student 

{

    public string Name {get;set;}

    public Phone[] phones {get;set;}

}

​

public class Program

{

    public static void Main()

    {

        var studentInfo = new Student[]{

            new Student(){Name="Bob", phones = new Phone[]{new Phone(){pNumber=123},new Phone(){pNumber=456}}},

            new Student(){Name="James", phones = new Phone[]{new Phone(){pNumber=789},new Phone(){pNumber=10112}}},

            new Student(){Name="Ram", phones = new Phone[]{new Phone(){pNumber=222},new Phone(){pNumber=3333}}

                             }};

        var phonesSelected = studentInfo.SelectMany(a => a.phones.Select(b => new {Name = a.Name, Cell = b.pNumber}));

        foreach(var p in phonesSelected){

            Console.WriteLine("{0} - {1}", p.Name, p.Cell);

        }

    }

}