Your business will need at least one telephone line to contact suppliers, receive customers' queries and so on. It is important to have internet access, an email address and probably a website. A business mobile phone is essential if you intend to spend a lot of time away from your business, for example buying stock and selling at fairs.
The telephone company will bill you every month or quarter for the calls you have made, often plus an amount for the line rental for the next quarter.
Various packages and discount structures are available to business users which can help to reduce telecommunications costs. Contact your telephone company's customer services department for details.
If you decide that you need business mobile phones as well as land lines there are many different deals available offering different options and payment plans.