If you’re looking for an affordable way to text your customers or staff from a browser rather than a cellphone, you can’t go past YouTXT (formerly AlertManager). This New Zealand based company is helpful and responsive to queries, and the text system itself is pretty easy to use, with a range of plans, including free and paid.
I have set up a retail and service client with YouTXT, and it has made the process of advising customers of finished jobs far easier than voice calls. Text based alerts reach customers more quickly – most people have their mobile phone with them all the time, and can read the message discreetly – great for students in class, or people in meetings. Replies from the customer can be set to go to a specific email address, so all replies can be easily monitored and responded to.