i asked them in customer service they said there is no need to put PIN
even if pin is not needed in winzows it doesn't hurt to insert the default pin (*) when you are configuring your modem in pclinuxos.
(*) go to etisalat site/mobile internet/faq and search for pin.
another thing: all mobile internet providers i know have also a default user name and password...
edit:
Etisalat
APN settings
username: (blank)
password: (blank)
APN name: etisalathttp://wiki.apnchanger.org/Egypt