If Possible, Take Your SIM Card Out
If your iPhone still uses a physical SIM card, then there might be a problem with it that you don’t even know about. Try removing your SIM card for a few seconds and then putting it back again to see if that helps.
This won’t be possible if you’re using an eSIM, as there’s no physical card to remove. However, you can still toggle your eSIM off and back on again, which is similar to removing a physical SIM card. Here’s how:
- Open the Settings app.
- Select Cellular.
- Toggle off the switch beside Turn On This Line.
- Wait about 30 seconds, and then tap on your line under SIMs and toggle Turn On This Line back on.
After you do this, your iPhone will begin looking for the closest and strongest cellular connection available. Once it finds one, try using your data plan to see if that fixes the issue.