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How To Fix When Your iPhone Has No Service
There can be a host of reasons for why your iPhone doesn’t have service, but one of the most common is the inability to receive a network signal, which can be caused, for example, by being underground or on a subway. Other causes include restrictions on roaming, cellular data usage being turned off or experiencing some kind of error, or using an older model with a lack of 3G.
For dead zones, either use a signal booster or keep moving to different spots to find an area where you do get a signal. Outside of that, the easiest fix (when it works) is to restart your iPhone to see if it's just a hiccup with the connection, but if that doesn't work, go to Settings > Cellular and turn "Cellular Data" off and back on again to attempt to re-establish a connection.
If you think roaming may be the issue, go to Settings > Cellular > Cellular Data Options and adjust the "Roaming" settings. You can turn Roaming on or off and control whether calls and data use 5G or LTE. Unfortunately, if the problem is an older phone and a lack of 3G, you might have to consider getting a newer model as it's only going to get more difficult to find service.
Your iPhone's network settings could also be causing the problem, in which case you'll want to try and reset them. For iOS 15, go to Settings > General > Transfer or Reset iPhone > Reset and select "Reset Network Settings," which will reset your cellular settings, recognized Wi-Fi networks (and passwords), and VPN settings if you use one.
Another possible issue is a change in your carrier settings, but to check for an update you'll need to make sure your iPhone is already connected to a Wi-Fi or cellular signal first. If you go to Settings > General > About and nothing happens in the menu, then the problem isn't your carrier settings, and you can try something else.