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Head over to:
Then, enter the area code and prefix for which you wish to get the local calling area. For example, if your number is (765) 482-xxxx, your area code is 765 and your prefix is 482.
Through the above site, you can find local calling areas for calls made from SBC landlines only. However, it will find all area code/prefix combos that are local calls, even those to non-SBC operated numbers, including pagers and cellular phones.
For those areas with calling zones ("bands"), the site will show only Band A (really local) area code/prefix combinations by default. You'll have to click "Show All Prefixes" to see Bands B and C. For a large city, such as Chicago, that's several thousand combos, so be prepared to wait a few seconds for the list to appear on your screen.