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携帯電話 doppio F1810のPDF マニュアルをオンラインで閲覧またはダウンロードできます。doppio F1810 13 ページ。

calculator:
 Press the up, down, left and right key to select +, -, ×, ÷ ,
respectively.
 Press left soft key to clear the figure.
 Press OK key to get the result.
STK
STK service is the tool kit of SIM card. This phone supports the
service function .The specific items are depended by SIM card and
network. Service menu will be auto added to the phone menu
when supported by network and SIM card.
1.11 Service
Users can access this menu to set Data connection SIM and Data
accounts.
1.12 Fun & Game
One game is embedded in this phone. For details, please refer to
the operation instructions of the game.
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