A portable phone includes dial keys (2) including at least one specific key and unspecific keys, and a processing unit (3). The processing unit determines whether one of the dial keys which is operated in a first mode is one of the unspecific dial keys, and changes an operation mode from the first mode...http://www.google.de/patents/US6944441?utm_source=gb-gplus-sharePatent US6944441 - Operation method of portable phone to change mode using dial key and apparatus for the same
