Why on earth are you still using a landline? A mobile phone will probably be cheaper, you can take it with you anywhere (even in your home), and most of them can sync with your computer contacts (or even your contacts in the cloud).
My landline is free (included with DSL, they're desperate to keep subscribers), whereas my mobile costs me $15/month.
The cordless phone works perfectly everywhere in the house, whereas the mobile only works in certain magic spots (they tell me this is a normal consequence of living way up in a high-rise).
The landline has crystal clear quality at all times, whereas the mobile is compressed and ugly even under the best of circumstances.
The landline lets me use any number of nice, easy-to-hold phones with great speakerphones, whereas the mobile only lets me use tiny little things that are impossible to rest on my shoulder while using my hands for anything.
The landline integrates perfectly with my Asterisk VoIP setup at no cost, whereas the mobile requires me to pay $0.04/minute when I route calls to it.
The landline + VoIP arrangement lets me call almost any country I need to at piddling charges ($0.00-$0.02/minute); the mobile is $0.05/minute at best for international calls and skyrockets upward from there for certain destinations.
A good landline phone costs $40 and a good VoIP phone costs $200. A good mobile costs $600.