To assess whether modem link from patient at home to hospital improves diabetes control. RCT: transmission of blood data via modem;N = 42.Patients in "telephone group" performed five blood glucose determinations/day twice/week and transferred data via phone once/week. Control group brought results in to clinic every 6 wk."Telephone" group counselled every week via telephone to adjust insulin and food intake Duration = 12 weeks. Here, INS is linked to diabetes mellitus.