1. The First Principle: It is not other people's responsibility to cope with your mobile phone use; it is your responsibility to use your mobile phone inoffensively. Please note that "inoffensively" is not defined by what you expect others to tolerate, but by what others do in fact find offensive. Ignore this principle, and you are sure to be rude
2. Following directly from the First Principle: You should assume that someone who asks you to turn your cell phone (or audio player) down or off is in good faith, and you should comply in good faith. They have a reason for asking, and it's probably not that they're trying to dominate you or hassle you or restrict your God-given right to free expression. (For example, people with temporal lobe epilepsy may find that certain sounds trigger seizures, and some people have neuro-sensory issues that cause extraneous noise to be a severe difficulty rather than a mild annoyance.)
3. Stay away from others while talking on the phone. If possible, keep a 10-foot (3 meter) distance between you and anyone else whenever you talk on your phone. Most people do not want to hear what you're talking about.
4. Try not to talk on the phone in any enclosed spaces, even if you're more than 10 feet away from anyone. They can still hear you (because it's an enclosed space) and usually, they're forced to just sit there and listen (and maybe be annoyed to some extent).
5. Don't talk too loudly. Generally you don't have to shout in the microphone to be heard on the other end. In fact, doing so often makes it harder for you to be understood. In addition, shouting on the phone disrupts people around you.
6. Don't put your phone on speaker. Just as many people do not want to hear your end of the conversation, they don't want to hear the other person's either.
7. Do not talk about personal details in public. Personal is just that: personal. If callers want to talk about personal details, tell them that you will call them back later, move someplace where you can have a little privacy, or switch to text messaging.
8. Don't multi-task. Avoid making calls while driving, shopping, banking, waiting in line, or doing almost anything that involves interacting with other human beings. In some situations it puts your life and the lives of others in danger, and in other situations it can bother some people.
Reference:
http://www.wikihow.com/Practice-Cell-Phone-Etiquette
