TelephoneKeyPad

This is a simple MVC 5 web application to demostrate how to generate all the alphanumeric combinations of a given phone number.

Background

E.161 defines the assignment of basic 26 Latin letters (A to Z) to the 12-key telephone keypad. An example telephone keypad:

Requirements

1. The phone number must be a 7 or 10-digit number (Validation).
2. The total number of combination must be calculated before generation (No nested loops/ brutal forcing).
3. Paged results.
4. Unit tests.
5. Develop on .Net Framework 4.5.x.

Example

If the input number is 222 555 6106 then the output is

Total number of combinations:

• 222 555 610M
• 222 555 610N
• 222 555 610O