> For the complete documentation index, see [llms.txt](https://penida.gitbook.io/cowlendar-help/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://penida.gitbook.io/cowlendar-help/how-to.../how-to-add-a-field-where-customers-can-enter-their-phone-number.md).
# How to add a field where customers can enter their phone number?
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**This is a Premium feature of Cowlendar.** You need to upgrade your plan if you want to use this feature and you are a free user of Cowlendar.
{% endhint %}
**Steps to add a custom field where a customer can enter there phone number**
1. In your Shopify admin bashboard look at the left panel and click on the **Apps.**
2. Click on **Cowlendar.**
3. Click on **My Servic**e.
4. Click **Edit** on the service you want to add a question to.
5. Click on the **Advanced tab.**
6. In the advanced tab you will scroll down and **find the Custom question section.**
7. Click on **What contact information to ask?**
8. Select **"Email + Phone" or "Phone".**
9. Click **Edit** on the **Phone question.**
10. Set your **default country.**
11. Click **Save.**
12. Click **Update.**