Email and telephone dimensions are not supported by Google Analytics, but you can use them to collect personal data from your users in Google BigQuery.
1. If you are using Google Tag Manager, make the following settings to collect email and telephone data to BigQuery
How to get values of these parameters is explained in Google Tag Manager Help Center.
2. Those who use analytics.js code on the website, have to use set command:
ga('set', "&tel", "+12345678900"); and
ga('set', "&email", "firstname.lastname@example.org");
3. If using Measurement Protocol add following parameters with URL encoded values: