Hi,
1. Name your range of client names say 'Clients'
2. Name your drop down cell say 'Selection'
3. Name your database say 'Data'
4. With your drop down cell use Data Validation and choose the List option specifying the list name as 'Clients'
5. If your database contains the list of clients in the first column then in A1 you can use
where column 10 of the database contains the phone number. And a similar VLOOKUP() in A2 but change the column number as appropriate.
If the list of clients is not the first column of the data then in A1 use
where column J in sheet1 contains the phone number. Adapt in A2 as appropriate and if necessary change the Sheet1 reference.
HTH
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