public VslaDdActivation FindActivationByImei(string imei)
        {
            try
            {
                var vslaDdActivation = (from a in SessionProxy.Query <VslaDdActivation>()
                                        where a.PhoneImei01 == imei || a.PhoneImei02 == imei
                                        select a).FirstOrDefault();

                //A Refresh of the ORM session would make this procedue call a bit slow but it is necessary for now
                SessionProxy.Refresh(vslaDdActivation);

                return(vslaDdActivation);
            }
            catch
            {
                return(null);
            }
        }