JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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It is possible to show phone in one field.
Here is how to do this:
1) Click on Tex Box Tool.
2) Drag and drop Text Box to your form.
3) Click on Size.
4) Change the value of size and click on OK.
5) It is ready to use.
Let us know if you need further assistance.