How to add a call button to my form?

i have form in which the sales executive type customer ph no.I want an call button below that phone number entry field so that when he calls the call goes from this mobile to verify he customer gets the call

To clarify, do you want to add a call button to your form? If so, please refer to this related thread for a workaround: https://www.jotform.com/answers/1688430

Let us know if you have further questions.