Hello Gibby4341,
Welcome to Apple Support Communities.
We understand that your iPhone doesn’t switch to cellular data or Wi-Fi when you leave and return from home. We are happy to help.
Let’s try the steps here: If you see No Service, Searching, or SOS on your iPhone or iPad - Apple Support
"Check your coverage area
- Make sure that you're in an area with cellular network coverage.
- Turn cellular data off and then back on again. Go to Settings, then tap Cellular or Mobile Data. If you're using an iPad, you might see Settings > Cellular Data.
- If you're traveling internationally, make sure that your device is set up for data roaming. Go to Settings > Cellular > Cellular Data Options > Data Roaming.
Restart your iPhone or iPad
Restart your device. If you're not sure how to do this, follow these steps to restart your iPhone or restart your iPad.
Check for a Carrier Settings update
To manually check for and install a carrier settings update:
- Make sure that your device is connected to a Wi-Fi or cellular network.
- Tap Settings > General > About. If an update is available, you'll see an option to update your carrier settings.
- To see the version of carrier settings on your device, tap Settings > General > About and look next to Carrier.
If you insert a new SIM card into your iPhone or iPad, you need to download the carrier settings for your new carrier.
Turn your cellular line off and back on
Go to Settings > Cellular and check to see if your cellular line is turned on. If your cellular line is off, turn it back on. Then check to see if you have service.
If you don't see your cellular line in Settings > Cellular, you should set up an eSIM or insert a physical SIM card. If you're using a physical SIM card, remove the SIM card and put it back in.
If your SIM card is damaged, doesn't fit in the SIM tray, or you transferred your physical SIM card from another device, ask your carrier for a new SIM card.
Learn more about removing your iPhone SIM card or iPad SIM card.
Reset your Network Settings
Go to Settings > General > Transfer or Reset [Device] > Reset > Reset Network Settings. This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you've used before.
Update your iPhone or iPad
Update your iPhone or iPad to the latest version of iOS or iPadOS.
Contact your carrier
Issues with your carrier or account might affect your service. Contact your carrier to:
- Verify that your account is active and in good standing.
- Make sure that there are no outages in your area.
- Check that your device isn't blocked from receiving cellular services and is set up with the right data plan.
Only your wireless carrier can access and manage details about your account:
These steps may help. Let us know if you have further questions.
Take care.
