september.org> 73DA4AB0   
   From: rcp27g@gmail.com   
      
   Larry Sheldon  wrote:   
   > On 7/1/2014 4:59 AM, rcp27g@gmail.com wrote:   
   >> On Monday, 30 June 2014 19:05:00 UTC+2, Stephen Sprunk  wrote:   
   >>   
   >>> I'm not aware of any mobile phone (Nokia or otherwise) with   
   >>> multiple line support.   
   >>   
   >> Every mobile phone I have owned, since the late 1990s, has supported   
   >> "call waiting".  When someone calls you while you're on the phone, it   
   >> makes a noise "in call", and allows you to put the current call on   
   >> hold, deal with the new incoming call, and resume the previous call   
   >> once the incoming one is finished.  Personally I don't have enough   
   >> phone traffic to make it a feature I need, but I know it's there.   
   >   
   > It is probably not a difference worth dying for but to me "multiple   
   > lines" implies multiple directory numbers (and in some sense or other,   
   > multiple facilities*) and a whole different model from "call waiting" and   
   > "conferenceing"  which are protocols for signalling to the switch that   
   > you want the call currently on the single "line" put on "hold" at the   
   > switch and either the waiting inbound call, or an originating register   
   > connected to that single line.   
      
   Dual sim phones are quite commonplace, and tri- and quad- sim handsets have   
   been produced, so if you want full multi-line capability in a mobile phone   
   (both smart phones and dumb phones) there are plenty of options. The two   
   main markets for them are frequent travellers having different sims for   
   different countries, and people having separate business and personal sims   
   in the same phone, or perhaps separate sims for data and voice. Not all   
   handsets can use more than one sim simultaneously, but there are definitely   
   some that can.   
      
   Robin   
      
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