Question About Pulling A Max Value On A Date For On Specified Criteria

Ok...
Here is what I want to to:
I have a number of tables, but this query concerns only two of them: Employee, Disposition, with a one to many relationship on the phone number.. Employee has personal info, and dispostion is a large table that keeps track of transactions. There is a unque_id for every transaction.

I want to pull some information. A date is assciated with each trans action on the disposition table. I want to be able to pull up all the unique employee phone numbers from a disposition table but only the latest date they made a transaction. My result should be only one phone nbr, one transaction number, and the date of the last transaction, per employee phne_nbr. But I can't seem to be able to pull this.

This query gets me the max date called per phne_nbr:

select 'Max'= max(dte_call), phne_nbr into TestTable
from Disposition
group by phne_nbr

The problem arises when I need to get the unique_id for that transaction, as I need it for other queries...The code below does not work...I get duplicate records and so forth.

select 'Max'= max(dte_call), phne_nbr, unique_id into TestTable
from Disposition
group by phne_nbr, unique_id

This shouldn't be that hard!! (((I tried a variation usin select distinct with the filed I wanted to be distinct in () otherfield, other field... but the distinct is not limited to the field in (), it gets the distinct record for the entire select ))) I must be missing something simple here. Can anyone help!!!