Hi and welcome! I have Ericsson T-600 which I purchased in Asia, the phone was workin fine there. When I come back home(Australia) I insert my sim-card (Vodaphone-Aus) from the old handset and phone starts going crazy...connects and disconnects all the time every 10-20 min. Make some inquiry in the local shops and I was told it might need different software, moisture inside,cant be repair etc...Anyone any ideas?