Cordless phones (not cellphones) are intended to be left on a charger except when in use on a call.
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Not always true. If your cordless phone uses a NiCad battery, leaving it on the charger all the time will cause the battery to develop a memory. This will cause your phone to run out of juice as the battery thinks it needs to be charged. However if your phone uses NiMh or Lithium-ion batteries, you can leave it on the charger.
Joe Sica