var a = from m in DbContext.Set<T1>()                    join q in DbContext.Set<T2>()                     on  new { m.ID, Phone=m.Phone1 } equals new { q.ID, Phone=q.Phone2 }                    where m.Phone1 !=null                    select new { m.ID, m.Phone1 };            a = a.OrderBy(m => m.Phone1).Skip(2).Take(2);

SELECT             [Extent1].[ID] AS [ID],             [Extent1].[Phone1] AS [Phone1],             1 AS [C1]            FROM  [dbo].[T1] AS [Extent1]            INNER JOIN [dbo].[T2] AS [Extent2] ON ([Extent1].[ID] = [Extent2].[ID]) AND (([Extent1].[Phone1] = [Extent2].[Phone2]) OR (([Extent1].[Phone1] IS NULL) AND ([Extent2].[Phone2] IS NULL)))            WHERE [Extent1].[Phone1] IS NOT NULL