There are so many things you can do by tapping the screen of an Android phone  —  or by holding your fingertip down for two seconds in what Google calls a “long press”  —    that most owners haven’t found them yet. I published a list of 12 tips for Android last week. Here are four more.

3D Maps — Get the latest release of Google Maps, a free download via Android Market. While looking at a map, you can tilt it by sliding two fingers vertically up or down the screen, and rotate it by placing two fingers on the map  — one at the top and one at the bottom, or one on each side  —   and making a circular motion.

Bigger browser font —  Do you find yourself constantly stretching Web pages with your fingertips to read them? Change the default font size instead. While looking at the Browser app, press the menu button on your phone. Tap the More option, then choose Settings at the very bottom (you may have to scroll down.) Change the first option, Text Size, from Normal to Large.

Stop the screen from turning off —  While your phone is plugged in, you can have it disable the battery-saving function that turns off the screen while you are reading, or using the phone as a bedside clock radio. Bring up the Settings app. Tap Applications, then Development. Turn on the “Stay awake” option. It was put there to help software developers. But we end users, in geek jargon, have plenty of uses for it.

Type contact names on the phone keypad — Unlike my other tips, this one works on an HTC Incredible but not on a Motorola Droid 2, so I suspect it’s an HTC add-on. Still, it’ll help a lot of HTC owners. Instead of finding address book contacts by bringing up your address book and then typing their names into the onscreen keyboard, bring up the phone’s keypad dialer, which has much larger, easier-to-tap keys. Tap your contact’s name on the keypad   —  e.g. 5-6-4 to spell J-O-H for John. The phone app will pop up a list of auto-complete options for the name from your address book. It’s both faster and easier than going through the address book. Dear Google: Can you build this into all Android phones?