Nexus One: How to Access Common Symbols and Punctuation Marks from the Letters Keyboard
Contributed by Rob Rogers 
Tagged: Android You probably know that accessing a comma, semicolon, colon, math symbols, etc. from the Numbers Keyboard (; : , / & @ ( ‘ ) ” – + ? or !), but having to switch back-and-forth gets to be a pain when you’re trying to input some text quickly. Luckily, you can access these symbols and punctuation from the Letters keyboard.
1. When you are ready to use one of the these symbols (; : , / & @ ( ‘ ) ” – + ? or !), you can do this by long pressing the period key on the letters keyboard.
2. A small window pops up allowing you to select the desired symbol.
Once selected, you return to the Letters keyboard.
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JoeVee said on February 15, 2010
Very useful and clearly defined.