A:AnswerMy Mother isn't using the portable but my guess would be that if she has to use line 2 to use the phone that maybe you need to use line one for the portable. Or possibly, you have to use line 2 for both.
A:AnswerI just purchased a SECOND set for a friend who needs a 2 line phone.
YES, this can have up to 12 handsets. I have 4 on the original one I own, and with a new base unit for my friend, I have 3.
A:AnswerThis is made for the USA - 120 V plug. You would need to convert it to use it, unless in an international marketplace you can find one set up with 220W.