MySql problem

Hi /prog/,

A MySQL noob needs some help here. I tried searching everywhere but it seems I cannot formulate my search expression correctly(English is not my first language). So the problem is. I want to limit the values that can be inserted in a column to certain possibilities. For example: I have a column phone_type and I want the only possible values there to be Work, Mobile, General and Fax. Any ideas? Sorry if this is too simple!

Easy way:
Put all your phone types in a single-column new table, create a primary key for it and add a foreign key constraint to the phone_type column.

Hard way:
Write a trigger function spitting an error if a user tries to put in a non-allowed value.

Hard way, God mode:
If a user tries again to insert the illegal value, do a DROP USER