iframes are generally hard to work with in a mobile app. Double-check your <meta viewport> tag to be sure it is configured properly. If you are trying to open external pages inside of an iframe, I recommend you use inAppBrowser, instead.
Thanks for your support!
I'm using inAppBrowser, but I have a doubt: Is it possible to open a url inside page/sub-page of project?
Is there a exemple with this application?