I have an Ericcson F221m, which has suddenly lost cellular signal. It went from excellent to vanishing completely, at around 1200 noon, Monday, January 31st. I have already contacted my provider, AT&T, and they have not discontinued broadcasting their frequencies. I have had my electronics technician bench-test my terminal, and the results were the same. His other four Ericsson FCT's are also getting no signal, and they were before Monday. What do you think is wrong?