At this point, the application should be complete. You may wish to build the solution and test it. Even though this example was intended to be simple, the overall concept may be used within an application to do some seemingly complex jobs. For example, if you were tasked with writing an application that monitored some sort of trend information such as a daily stock price, and were to alert a group of end users whenever the stock price exceeded some predetermined, agreed upon value, you could do something such as looping through a collection of users subscribing to the stock price monitoring service and direct a text message to each of these users indicating that the watched stock had surpassed the threshold value.
Also, please note that, whilst it does cost you a dime to send a message to a cell phone in this manner, it may well cost the recipient something to receive it. Bearing that in mind, as you test your version of the code, be mindful of any expenses you may be generating for yourself (if, for example, you are sending messages to yourself) or another person.
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