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Sep 2, 2014 8:10 AM in response to hongbofromuniversityparkby pedro d,Hello there.
The following Knowledge Base article offers up some great recommendations for troubleshooting the issue you're describing:
iPhone: Troubleshooting No Service
http://support.apple.com/kb/ts4429
If you encounter any of the above symptoms on your iPhone, follow these steps to try to resolve the issue. Test after each step.
- Toggle airplane mode: Tap Settings > Enable Airplane Mode, wait five seconds, then turn off airplane mode.
- Turn your iPhone off, then on again.
- Remove the SIM card and verify that it's a valid, carrier-manufactured SIM. Also verify that it isn't damaged, worn, or modified. Then reinsert it.
- Check for a carrier-settings update. Connect to a Wi-Fi network. Then tap Settings > General > About. If an update is available, iOS will ask you if you want to install it. If Wi-Fi isn't available, connect your device to iTunes.
- Update your iPhone to the latest version of iOS.
- Reset network settings by tapping Settings > General > Reset > Reset Network Settings. This will reset all network settings, including Bluetooth pairing records, Wi-Fi passwords, VPN, and APN settings.
- Restore the iPhone.
Thanks for reaching out to Apple Support Communities.
Cheers,Pedro.
