Communication - courteous and effective

One of the key things in sailing smoothly through life is making communication between yourself and others as painless and easy as possible.

Tip 1 - Always acknowledge receipt of a communication.
If they want you to do something that you agree with even just a reply of "ok" is fine.
If you need to talk about it before doing or not doing it, but you can't talk now, then "need to talk about it, will call you later" is perfectly reasonable.
(Note: I've put this in the abrupt style of an SMS, because it's the briefest and most easily mis-interpretabale form of communication used)
Often we send things into the ether via email or SMS and have no way of knowing if they've been received until we get feedback. Many people just assume it got through and then get shirty when the recipient hasn't done the thing requested. Save yourself the angst and follow-up if you don't get a response, and give them the benefit of the doubt, don't just assume they're blowing you off. If you are the recipient, save yourself the stress of being "harassed" and just send a response quickly.

Tip 2 - A basic communication, usually a request for some information, should have three steps.
- Request for info/thing
- Supply of info/thing (see tip 1)
- Confirm receipt and whether it was or wasn't what you needed
The third step is important, especially if the person sending you the info is a friend or otherwise cares that they've been able to help you. Invest in some good karma and don't make them stress. Or if you don't care about that, save yourself future hassle by not training people to assume that info has gotten through.