De-duplicating leads using Phone Numbers

[Anonymous]

I have a list of leads from a tradeshow which doesnt have any email addresses, but it does have phone numbers, I want to enter these in to Marketo and make sure duplicates are not created and are existing leads are simply added to the new list.

How should I go about doing this? Is it possible to de-dupelicate using a phone number as a common denominator?

[Anonymous]

You may have a problem with this too. Many companies have main number that every one uses and then they have their own extensions.  

[Anonymous]

Kimi, per usual, is correct. Filter is "Duplicate Fields"

[Anonymous]

Graeme, you may want to pull the data out of Marketo and do the de-duplication in Excel. You're likely going to need to format the numbers before comparing them. I don't think Marketo can de-dupe on anything but email address.

[Kimi_Heskett1]

Hi Graeme, I believe the only fields you can duplicate search on are email, full name, last name, Marketo unique code or name and updated at.