When I open a Bootstrap 3 modal on iOS9 Safari, the screen zooms in. It is working as expected on the Chrome app on iPhone. Below are the pictures which show the issue.
Safari screenshot:
Chrome screenshot(expected behavior):
The following code fixed the issue for me (and some other people -> see GitHub link):
body {
padding-right: 0px !important
}
.modal-open {
overflow-y: auto;
}
Source: https://github.com/jschr/bootstrap-modal/issues/64#issuecomment-55794181