Question : Need to delete phone numbers from new table which have already been used in a previous table but need to keep unused numbers.

I have a preexisting table of phone numbers that were used as reference. I have a new table (same column header) with new numbers but also containing some of the already used numbers. I need to know how I can use pull out the old numbers in the new table using the old list.

Answer : Need to delete phone numbers from new table which have already been used in a previous table but need to keep unused numbers.

>I'm a beginner and I have no idea what to do with what you just suggested
This doesn't bode well to getting a solution here...

Make a backup copy of your .mdb first

Hit {f11} to get to teh Database Window
Queries, New..., and when the Add Table dialog pops up hit Cancel.
Choose 'SQL View' in the tri-state button that allows you to toggle between Design View, Datasheet View, and SQL View
Copy-paste nexusnation's comment into the SQL view, change any air-code-like object names to whatever you have (e.g. we'll assume you don't have a table called NewTable), then run.