Hello, The field CallOnlyPhoneNumber <https://developers.google.com/adwords/api/docs/appendix/reports/ad-performance-report#callonlyphonenumber> should return the phone number of the call-only ad, however, this field is not filterable. That said, you cannot use it as a predicate. I recommend you add this field in the selected report fields and manually filter this number from the report spreadsheet generated.
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