Phone Number Field Not Matching With MailChimp

I have Gravity Forms and the MailChimp add-on submitting a form that includes 2 fields for phone numbers. Mailchimp automatically creates 3 seperate fields for the area code and the two parts of the phone number (US/CANADA style).

So, when I submit my form, my number ends up looking like this in the MailChimp subscriber info:

((555)555) 5555-

I have tried using specific number formats and everything in the Gravity Form field for the phone numbers, but it always ends up looking like that.

Is there a better way to handle this so the number transfers cleanly? Should I just use a standard text field on the MailChimp side?

I was having this same problem and found a temporary solution. As you suggested, use a plain text field and it transfers over just fine. I entered the phone number in the format xxx-xxx-xxxx and Mailchimp entered it on the phone column as (xxx) xxx-xxxx. Just what I needed. Temporary solution until forms are updated.