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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
```text
(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 formatted 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.
## Loading your exercise implementation in PolyML
```
$ poly --use {exercise}.sml
```
Or:
```
$ poly
> use "{exercise}.sml";
```
**Note:** You have to replace {exercise}.
## Running the tests
```
$ poly -q --use test.sml
```
## Feedback, Issues, Pull Requests
The [exercism/sml](https://github.com/exercism/sml) repository on
GitHub is the home for all of the Standard ML exercises.
If you have feedback about an exercise, or want to help implementing a new
one, head over there and create an issue. We'll do our best to help you!
## 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
74 entries across 74 versions & 1 rubygems