Hi @innomalous, Thanks for your support threads. I checked your issue. Actually, Elementor native popups load gravity forms assets after opening popups. For this reason, some features of gravity forms are not working. Ex: recaptcha, multiple select, and more.
And for that same reason, smart phone field is not working. For testing purposes, I added the same form twice in the popup (with elemetnor) and on the normal page. I added a demo link. You can check it. Demo Link
For solving this issue, You can use Popup Maker plugin.
Thanks for your patience.