how to convert sql to linq
select s.IdSimcard ,s.Imei from dbo.SimCard s
where s.Imei  not in (select distinct d.Imei  from dbo.SimCard d  inner join dbo.Configuracion c
on c.SinCard_IdSincard = d.IdSimcard
where c.Estado = 'Activo' )

(from s in SimCard where  s.Imei.Contains( (from c in Configuracion
                             join d in SimCard on c.SinCard_IdSincard equals d.IdSimcard
                             where c.Estado == "Activo"
                             select new { d.Imei }).Distinct())
                             select new {  s.IdSimcard, s.Imei })