US phone numbers

I'm building an app that uses phone numbers to perform different tasks, and recently I've had quite a few requests to implement it for the US market. Unfortunately as I live in 开发者_如何学Pythonthe UK I don't have much knowledge of US phone number formats, and with so many USA users on here I was hoping some of you would be able to help.

I'm looking to obtain a list of sample phone numbers as they appear in your call log on your mobile phones. I'm trying to determine if they come through in the format +1234567, +001234567, 001234567, 01234567, 1234567, 234567 etc, or perhaps the format can vary..

Hopefully you're hesitant about giving out phone numbers on the web, so feel free to change a few digits (I'm mainly interested in the first few digits and the format of the numbers).

The more numbers you can provide the better, thanks!

The following formats are common:

+12312322334
2312322334
(231) 232-2334
2322334
232-2334

The last two forms are unusual, though may be encountered. The area code is implied to be local to the phone.

Note that there are some invalid entries: Numbers never start with a "1" (thats the long distance dial indicator, optional on cell phones), the "555" prefix is reserved (so commonly used in movies).

U.S. phone numbers have three parts: A three-digit area code, a three-digit number, and a four-digit number. Generally, these are written in the format (234)-555-1234. If you are calling from the same area code as the person you are calling, you can omit the area code (the (234) part). For landlines, you often need to input a 1 first if you intend to include the area code, but most cell phones don't require this.

As I say -- interesting q. Have you searched for something like "dirty north american phone format" or "how are north american phone numbers typically formatted"? Struck me as being something that has to be done often.

Google brings up this as an example: Phone number format provider. It has a) some example formats and b) some code that actually deals with dirty or non-standard formats, and reformats them ...

So -- from my comment I guess I'd strip spaces (and hyphens) to start with, but from then on assume that you've got a right-most part of the number, and that any missing left-most parts represent increasingly wider geographic areas.

In reverse -- if the assumption works, you can create your own sample numbers by taking a standard format number and chopping groups from the left hand side -- I think.