Update to 15 issue
I recently updated to IOS15 and now don’t have a connection in some apps unless I am connected to Wi-Fi. I already restarted my phone and reset my network? What else can I do?
iPhone 12 Pro Max, iOS 15
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User profile for user:
AppleJen77
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Community Specialist
Hello there, mom23als!
Thanks for reaching out to the Apple Support Communities! It sounds like you have an issue with some of your apps not connecting to the internet unless you are on Wi-Fi. You;ve done great steps so far restarting and resetting the network settings. Let's be sure the apps are set up to work on cellular as well as Wi-Fi by checking out the steps in this article to View or change cellular settings on iPhone:
"Set cellular data use for apps and services
Go to Settings 
> Cellular, then turn Cellular Data on or off for any app (such as Maps) or service (such as Wi-Fi Assist) that can use cellular data.
If a setting is off, iPhone uses only Wi-Fi for that service."
Let us know if the issues continue and have a great day!