Hi xenialavless,
welcome to the Apple (user-to-user) Community.
Re: Safari and other applications dependent on the Internet do not work
Wondering if you have a strong wi-fi signal,
Connect to Wi-Fi on your iPhone, iPad, or iPod touch - Apple Support
and what to do: If your iPhone or iPad won't connect to a Wi-Fi network
Also: Recommended settings for Wi-Fi routers and access points - Apple Support
Resolve Wi-Fi and Bluetooth issues caused by wireless interference - Apple Support
You might want try turning Off Hotspot & VPN to check if that helps.
Some third-party (non-Apple) apps (especially virus-checkers, add blockers, etc.) can cause difficulties, so try turning them off.
if you are depending on cellular.
What to do: If you see No Service or Searching on your iPhone or iPad - Apple Support
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How to: Connect iPhone to the internet - Apple Support
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If needed:
You might want to reach out to iPhone Support:
There's a "Get Support" link at the bottom of their website (link below),
iPhone - Official Apple Support
All the best :-)