When you ask a question where your lead needs to enter a number (age, height, area, etc.), you can make it easier for your visitor by using a number field.
Here's how to do it:
Go to your funnel.
Navigate to the page where you want to insert the number field.
Go to your form block.
Then, click on the field after which you want to insert the number field and add a "Custom" field using the + symbol.
Enter a description for your new field and choose a suitable emoji.
Now, on the top left, you will be able to see a small calculator symbol. Click on this symbol to activate the numeric keypad for your new field.
Almost done! In the next step, click on Publish (top right) and then click "Publish Changes" to display your changes in the live view.
From now on, if you open your funnel on your smartphone, you will see that tapping the number field will bring up a keyboard.