Digital phone systems differ from classic analog telephone service in their type of transmission. Analog systems are based on original telephone technology: electrical-based transmissions that travel over their installed lines (wires) to and from your home. Digital phone service uses basic computer technology, sending voice signals in binary code ("1's" and "0's") to your home handset.
This highly technical and wide difference may or may not result in striking variations from your current voice communications quality. The level of quality improvement depends on the reliability and purity of your current landline analog service. All major cable TV systems deliver digital phone service is a significant upgrade because of their ability to deliver clear TV signals and Internet service to your home.
However, if your local landline company, delivering signals with classic analog technology, is reliable and not subject to many electrical fluctuations or weather interruptions, you may not graphically notice the difference. But, if you live in areas affected by aging telephone wires, adverse weather or climate conditions, or other issues causing electrical fluctuations, you might quickly notice the difference in using computer technology.
Problem resolution is also sometimes a difference that you might notice. It is sometimes much easier to resolve a pure computer-related issue than an often more difficult telephone transmission problem. Since digital phone service providers use computer-based binary signals, using up-to-date software can often diagnose and repair problems quicker than diagnosing and fixing classic analog phone issues.