Not trying to dodge the question but what did you try?  

Like you and I have discussed previously, it is all just putting the pieces together.
Richard says, "He provides the Legos. It it up to you to put them together in the way that works for you."
Just break it down into the parts first, then build it up to what you want it to be.  Write the steps you need to follow out in English then convert what you are doing to Access.

First check out the Search Form 2.0.  

For the search part, a little bit of it depends on how you are storing the numbers - with or with out the dashes and parenthesis (555) 222-1234 or just the number - 5552221234 ?  
How are your tables set up to store the numbers?
One field in a separate table with designation for type (home, cell, business) or do you have them in three different fields?

The counting part would be pretty easy to add into the searching part. First check out the DCount and even more extensively in Access Expert 29.

For setting the value of the field, wrap the DCount in an IIF Function.

So say that we call your field FFClub to identify they are frequent caller you could just set that to the result of your DCount

So psudo code:
    FFClub = IIF DCount of the Phone >= 10, then FFClub = true otherwise FFClub = False.

You could also use  Conditional Formatting to make the number stand out.