using the api you can pass in the URL what props you want if you dont want to pull the whole set of props. just app &property=phone .. the &property param can be use multiple time in the same request. So, you can request all the props you need from the user. I would recommend using the get contact by email api endpoind
you could try to sync your contacts with and external application on your own servers to create and index of phonenumner/users id and use that to get the user ID and pull their information from hubspot. There is no api endpoind that will let you find a contact using their phone number or other prop other than email/name or user id
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using the api you can pass in the URL what props you want if you dont want to pull the whole set of props. just app &property=phone .. the &property param can be use multiple time in the same request. So, you can request all the props you need from the user. I would recommend using the get contact by email api endpoind
you could try to sync your contacts with and external application on your own servers to create and index of phonenumner/users id and use that to get the user ID and pull their information from hubspot. There is no api endpoind that will let you find a contact using their phone number or other prop other than email/name or user id
If this post helped you resolve your issue, please consider marking it as the solution. Thank you for supporting our HubSpot community.