Why stored procedure out parameter is not getting read by entity framework's ExecuteSqlCommand method?

I am trying to read the OUT parameters value returned by stored procedure but it throws error DBNULL. Even the procedure is returning the value.

Code:

   int? outParam= 0;

   SqlParameter sqlParam= new SqlParameter("@model", user.Name+" Model");
   SqlParameter sqlParamOut = new SqlParameter("out", outParam);
   sqlParamOut.DbType = System.Data.DbType.Int32;
   sqlParamOut.Direction = System.Data.ParameterDirection.Output;

   UsersPhonesDBContext.Database.ExecuteSqlCommand("dbo.InsertPhones @model, @out", sqlParam, sqlParamOut);

   outParam = Convert.ToInt32(sqlParamOut.Value);

SP:

alter PROCEDURE InsertPhones (

    @model varchar(100),
    @out int output
)
AS
BEGIN
        Insert into Phones (Model, Manufacturer)
        Values 
        (
            @model,
            'Hunain Phone'
        )

        set @out= SCOPE_IDENTITY();
        Select @out
END
GO