Whether or not anyone will actually care at the end of the day is debatable, but one device retailer has published a list of do’s and don’ts for those conflicted over the use of their handheld devices. Mobile device e-tailer LetsTalk released its user’s guide to cell phone etiquette, which while seemingly obvious, is actually based on what the company identifies as comprehensive annual surveys on cell behavior dating back as far as 2000. The list may appear painfully evident to those people who already consider themselves considerate in how they wield their handhelds, but those same people may take solace in the fact that the guide exists to educate the seemingly ubiquitous masses of mobile owners who have yet to realize that subtlety and refinement aren’t only for the dinner table.