Hi 琴80,
Thanks for using Apple Support Communities. It sounds like you’re having trouble loading UNiDAYS in Safari on your iPhone. We’re happy to help.
While the title of the article below may not seem to pertain to your exact issue, these are good steps to take for issues loading pages in Safari:
If Safari displays a blank page or quits on your iPhone, iPad, or iPod touch
Should the issue persist, see if you’re able to load the page in a browser on a different device. If you can, contact Apple Support.
If you can’t load the page on a different device, contact UNiDAYS:
Take care.