If your iPhone 7 Plus keeps dropping its signal or shows a constant “No Service” message, you won’t be able to make calls, send texts, or use mobile data. This guide will walk you through the most effective fixes to get your phone back on the network.
Check Your Account Status
Before diving into phone troubleshooting, double-check with your carrier that your account is active and in good standing. If there’s a billing issue, your services might be temporarily cut off. Call or chat with your carrier to rule this out.
Restart or Force Restart Your iPhone
Temporary software glitches can mess with your network connection. A simple restart might do the trick.
To force restart your iPhone 7 Plus:
- Press and hold the Power and Volume Down buttons at the same time.
- Keep holding both for about 10–20 seconds.
- Release when the Apple logo appears.
This won’t delete any of your data.
Toggle Cellular Data
Sometimes the fix is as easy as turning Cellular Data off and back on again.
- Go to Settings > Cellular.
- Toggle Cellular Data off.
- Wait a few seconds, then turn it back on.
You can also try turning Automatic Carrier Selection off and selecting your carrier manually:
- Go to Settings > Cellular > Network Selection.
- Toggle off Automatic and wait for available networks to appear.
- Choose your carrier from the list.
Note: This option may not show up on all carrier networks.
Remove and Reinsert Your SIM Card
If the SIM card is loose or damaged, it can cause signal issues.
- Power off your iPhone completely.
- Use a SIM eject tool or paperclip to open the SIM tray (right side of the phone).
- Remove the SIM card and inspect it for damage.
- If it looks fine, put it back in securely.
- Turn your phone back on and check if the signal returns.
If the SIM is scratched or bent, ask your carrier for a replacement (nano SIM size).
Reset Network Settings
If there’s a misconfiguration in your network settings, resetting them might help.
- Open Settings.
- Tap General.
- Scroll down and select Transfer or Reset iPhone > Reset.
- Tap Reset Network Settings.
- Enter your passcode if prompted, and confirm.
Your phone will restart and wipe saved Wi-Fi passwords, VPN settings, and Bluetooth pairings — so reconnect to Wi-Fi afterward.
Update to the Latest iOS Version
Buggy software can mess with your iPhone’s cellular functions. Updating iOS may fix it.
To update via Wi-Fi:
- Go to Settings > General > Software Update.
- If an update is available, tap Download and Install.
No Wi-Fi? Connect your phone to a computer with iTunes and check for updates that way.
Before updating, it’s a good idea to back up your data via iCloud or iTunes.
Try a Full Restore (If Nothing Else Works)
If the problem started after a failed update or sketchy app installation, you may need to fully restore the phone.
You can do this using iTunes in:
- Recovery Mode – for general problems.
- DFU Mode – for deeper, system-level issues.
Check out a trusted walkthrough (or Apple’s support site) for step-by-step instructions. Be warned: restoring your phone erases everything, so back up first.
Contact Your Carrier or Apple Support
Still no signal? Contact your carrier to check for SIM card issues or outages in your area. If your SIM is fine and your account is active, the problem could be hardware-related — like a faulty antenna or logic board. In that case, visit an Apple Store or authorized repair center to get your iPhone checked.