When we are aware of the telephone number we are ringing, it may be the numbers that are important. We also may be aware of the need to contact a specific person who we can help, or who can help us.
If we are searching for a telephone number we are having difficulty in co-ordinating our thoughts about our future actions. Using the telephone suggests a direct one-to-one relationship.
The type of phone will also have relevance; an old-fashioned one suggests ancient ideas or concepts.
A modern up-to-date digital or mobile phone indicates we are easily able to make ourselves understood in various situations.