with the area code in parenthesis [with phone numbers ..
How do I add parenthesis to my phone number list …
Some more creative letter arrangements (1 = ABC, 2 = DEF, etc)can be found on some european cellular phones. Europe does not share north america's fascination with old exchange names, and -- more importantly -- vanity numbers are somewhat of a novel concept. Maybe this lack of historical baggage allowed some europeancell phone manufacturers to take a fresh approach to assigning letters to numbers.
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Writing and reference manuals offer different advice for creating lists. It seems that as long as you're consistent within your document, you can devise just about any means you want for creating your lists, whether you want them as run-in lists (built into the flow of your text) or as vertical lists (indented and stacked up). Technical writing may have its own requirements in this regard, and you should consult a technical writing manual for specific rules. Use parentheses around the numbers (no periods after the number, though) when using a run-in list: