update cutomer phone number with Flow

Topic summary

Main issue: Shopify Forms captures name/phone/email and creates new customers correctly, but it does not update the phone number for existing customers who submit the form. The author asks if Shopify Flow (Shopify’s automation tool) can be used to auto-update a customer’s phone after a form submission.

Context: Shopify support indicated phone update for existing customers may be a future feature, prompting a search for a current workaround.

Responses/Proposals:

  • A third‑party option was suggested: the “Haptech: B2B/wholesale” app to add phone numbers and related customer information.

Status and open questions:

  • No concrete Flow-based solution or workflow steps were provided.
  • It remains unclear whether the suggested app specifically updates the phone on existing customer records upon form submission.
  • Discussion is open/unresolved; key question: can Shopify Flow listen to a Forms submission and update an existing customer’s phone field automatically without an additional app?

No images, code, or attachments are central to understanding the thread.

Summarized with AI on December 24. AI used: gpt-5.

I use Shopify Forms app and there are three fields in that form: name, phone, email. That form successfully creates new customers and save all three fields, but there is a problem that the form doesn’t update the phone number for customers which were already existed. So, for example the customer already created his account (through checkout or through any other) so I have his email in the admin panel but there is no phone number in his contact info. and this specific customer filled out my form and provided his name, phone and email. The form doesn’t update the phone in such case.
Support says that maybe they will add such feature in the future, but maybe there is a way to achieve it with Flow?
so what I need is to create such custom Flow which update the phone number of customer after he fulfilled the form.

Hi Miles_Bell

You can install this app to add phone numbers to customer information and other related information

Haptech: B2B/wholsale