Thanks for posting in the Apple Support Communities Dcdahlin,
If you're traveling, you may be trying to connect to a captive Wi-Fi network. Review the guidance for these types of networks, here: Use captive Wi-Fi networks on your iPhone or iPad
Regarding cellular service, you can either work with your existing cellular service provider, or purchase or rent a local SIM card to use in the area you're currently in. Learn more, here: About cellular data roaming options for your iPhone and iPad
We hope this helps!