All the above...
-Basic Land line (mainly for faxes and dsl, also for backup purposes, you can't beat a landline for quality and reliability)
-Cel phone (for the obvious)
-Voip (for most of our calls from home to save on cell mins, but not nearly what its cracked up to be. Quality is way below par, it works like a cel phone, sometimes good, sometimes not so good. You get what you pay for...)
Although i am bias, I work for at&t.... I will say they are the #1 telecommunications company(and one of the largest companies in any department in the world) for a reason and just wait, the new fiber optics and tv service that will come in year or so will dominate all options....