Nokia 9290 Nokia 9290 Communicator User Guide - Page 62

Getting started 44 Cell handover As the phone user moves from one network cell to another, the signal strength of the channel drops and the wireless telephone exchange may handover the user to a different cell and frequency, where the signal is stronger. A cell handover may also occur when the user is stationary, due to varying wireless traffic loads. Such handovers may cause slight delays in the transmission. Electrostatic discharge A discharge of static electricity from a finger or a conductor may cause erroneous functions in electronic devices. The discharge may result in distorted display and unstable software operation. Wireless connections may become unreliable, data may become corrupted, and the transmission halted. In this case you need to end the existing call (if any), close the cover and switch off the phone (if on) and remove the battery. Then replace the battery and establish a new wireless connection. Dead spots and dropouts Dead spots are areas where radio signals cannot be received. Dropouts occur when the phone user passes through an area where the radio signal is blocked or reduced by geographical features or large structures. Signal impairment Distance and obstacles can cause signals to become out-of-phase. They can also cause reflected signals. Both situations result in a loss of signal strength.