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

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

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.

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