Welcome to the world of mobile phones. As mobile phones become less expensive and more accessible, Jamaicans are becoming less concerned about the proper way to use the phone. Basic courtesies, and some new ones, apply to mobile-phone usage.
Let's start with making a call. Unless you are calling a friend or calling in an emergency, there is not likely to be a business reason to call someone before 6 a.m. Check the number before you dial, then check it again. Dialling the wrong number is a waste of money and annoying. Of course, everyone makes mistakes; if you make this one, politely let the person know before hanging up - don't just hang up in their ear.