Nokia 9210i Betriebsanweisung

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Radio interference from electronic appliances and equipment, as well as from 
other phones will affect the quality of wireless data transmission.

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.

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 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.