The phone service you use depends upon what your needs are. If you run a small business, for example, you'll need a more comprehensive phone service than you'll need for personal use. As your business grows, you'll also find that your phone service needs will grow as well.

You also need to consider the cost of calls.

Some phone services offer very cheap local calls, but will charge you a lot more for long distance or international calls. Others work the other way around, and may even make special deals if you call specific places around the world frequently.

Your phone service may also affect your internet connection if you use dialup or ADSL. This is something to consider when choosing a phone service provider (although most will work well for internet usage). However, some phone companies also include internet plans, which could help you save more money.