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# Phone Number

Clean up user-entered phone numbers so that they can be sent SMS messages.

The **North American Numbering Plan (NANP)** is a telephone numbering system used by many countries in North America like the United States, Canada or Bermuda. All NANP-countries share the same international country code: `1`.

NANP numbers are ten-digit numbers consisting of a three-digit Numbering Plan Area code, commonly known as *area code*, followed by a seven-digit local number. The first three digits of the local number represent the *exchange code*, followed by the unique four-digit number which is the *subscriber number*.


The format is usually represented as
```
(NXX)-NXX-XXXX
```
where `N` is any digit from 2 through 9 and `X` is any digit from 0 through 9.

Your task is to clean up differently formated telephone numbers by removing punctuation and the country code (1) if present.

For example, the inputs
- `+1 (613)-995-0253`
- `613-995-0253`
- `1 613 995 0253`
- `613.995.0253`

should all produce the output

`6139950253`

**Note:** As this exercise only deals with telephone numbers used in NANP-countries, only 1 is considered a valid country code.

### Submitting Exercises

Note that, when trying to submit an exercise, make sure the exercise file that you're submitting is in the `exercism/csharp/<exerciseName>` directory.

For example, if you're submitting `bob.cs` for the Bob exercise, the submit command would be something like `exercism submit <path_to_exercism_dir>/csharp/bob/bob.cs`.
## Source

Event Manager by JumpstartLab [http://tutorials.jumpstartlab.com/projects/eventmanager.html](http://tutorials.jumpstartlab.com/projects/eventmanager.html)

## Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have completed the exercise.

Version data entries

97 entries across 97 versions & 1 rubygems

Version Path
trackler-2.2.1.103 tracks/csharp/exercises/phone-number/README.md
trackler-2.2.1.102 tracks/csharp/exercises/phone-number/README.md
trackler-2.2.1.101 tracks/csharp/exercises/phone-number/README.md
trackler-2.2.1.100 tracks/csharp/exercises/phone-number/README.md
trackler-2.2.1.99 tracks/csharp/exercises/phone-number/README.md
trackler-2.2.1.98 tracks/csharp/exercises/phone-number/README.md
trackler-2.2.1.97 tracks/csharp/exercises/phone-number/README.md
trackler-2.2.1.96 tracks/csharp/exercises/phone-number/README.md
trackler-2.2.1.95 tracks/csharp/exercises/phone-number/README.md
trackler-2.2.1.94 tracks/csharp/exercises/phone-number/README.md
trackler-2.2.1.93 tracks/csharp/exercises/phone-number/README.md
trackler-2.2.1.92 tracks/csharp/exercises/phone-number/README.md
trackler-2.2.1.91 tracks/csharp/exercises/phone-number/README.md
trackler-2.2.1.90 tracks/csharp/exercises/phone-number/README.md
trackler-2.2.1.89 tracks/csharp/exercises/phone-number/README.md
trackler-2.2.1.88 tracks/csharp/exercises/phone-number/README.md
trackler-2.2.1.87 tracks/csharp/exercises/phone-number/README.md
trackler-2.2.1.86 tracks/csharp/exercises/phone-number/README.md
trackler-2.2.1.85 tracks/csharp/exercises/phone-number/README.md
trackler-2.2.1.84 tracks/csharp/exercises/phone-number/README.md