Ambulatory care supporting long-term treatment of type I diabetes mellitus (DM) is based on the analysis of daily notes of serum glucose measurements, carbohydrate intake, and insulin dosage. In order to improve glycaemic control, telemedicine support aims at improving the communication between patients and diabetologists. Patient data are collected using mobile phone services. Weekly responses from the diabetes care center aims at helping the patient to optimize glycaemic control. The telemedical support system VIE- DIAB integrates data collection, visualization, and recommendation handling by using mobile phone and internet services. Its core is a module visualizing a summary of the patient’s diary. Data are displayed using 4x7 multiples that represent the serum glucose values of 28 days on one page.