Abstract: The aim of present study was to investigate the cellular phones emitted EMFs (Electromagnetic fields) effect on serum progesterone, cortisol and glucose concentration in exposed female hamsters. Seventy two female golden hamsters (mature and non-pregnant) were used. The animals were divided into three groups: group 1- the control group without any EMF exposure; group 2- the short-term EMF exposure (10 day, 3 h daily) and group 3 - the long-term EMF exposure (60 day, 3 h daily). The 950 MHZ EMFs emitted by the antenna of cellular phones (Specify: ON, SAR: 0.60 week kg-1) was produced for short- or long- term (group 2 and 3), respectively. Exposing to 900 MHZ EMF caused decreases in progesterone (p<0.01) and increases in cortisol for both exposed groups (short-term and long-term) (p<0.01) in comparison with control group. Group exposed for 60 days had significantly higher blood glucose rate in comparison with control or short-term exposed groups. May, 950 MHZ EMFs caused stressful condition, cortisol releasing and subsequent hyper-glycemia in long-term exposing. Also, adrenal and reproductive glands may affect by 950 MHZ EMFs and caused changes in serum progesterone rate. It was concluded that short-or long-term exposure to 950 MHZ may cause progesterone suppressing and cortisol releasing but this frequency only in long-term exposure could cause hyper-glycemia in hamster as a laboratory model.