The simplest way to print from one of these mobile devices is not to print at all: it’s to do what most users probably do, which is to e-mail yourself the photo, link, or note in question and then wait until you get to a Mac or PC, retrieve the e-mail, and either access the URL or print the attached photo or the contents of the message. Though simple, this is not an especially easy or elegant solution. Its biggest merit is that it works consistently and reliably, and almost ensures you don’t lose vital information.
Fortunately, third-party app makers have come out with a number of products designed specifically for printing from your iPhone. Some of these apps have been upgraded many times since their introduction—including new hybrid versions that run on the iPad as well as Apple’s other devices.
via Printing from your iPhone, iPod touch, and iPad | Printers | iPhone Central | Macworld.
