Around one hundred years ago, about the only reliable way of communicating with people was either face-to-face, or by way of HM postal service. How things have changed since the start of the 20th century; nowadays there are landline phones, mobile phones and computers that can be relied upon.
To any new business, such forms of communication never come cheap. If you are obliged to furnish a number of your employees with mobile phones, this really will add up and will always be an extra overhead where you may be looking to save some money.
There are ways around this: some mobile phone companies may be able to offer your business a tariff that allows for such multiple users; some may even suggest the use of business sim only contracts. At the end of the day, it is always a good idea to investigate all of the possible options here, in order to track-down the package that will be best for your company.
Everyone knows that it is free to send an actual e-mail, however, you do have to fund the cost of the computer and broadband connection - meaning that even this form of communication can become expensive.
Methods of communication have increased exponentially over the past one hundred years or so, but these do all come at a big cost to your business, therefore a frugal and investigative approach is always highly recommended.