I am having the exact same no service issue. I am have tmobile and just read a bunch of posts on the verizon site also. So I know it's not a carrier issue. It is very frustrating. I have done all steps other than the iTunes reset. The only thing that has worked for me temporary is calling my carrier and doing a network reset while the reset my network connection from their end. But this only works for a few days. I first noticed the problem after the ios 7 update. Please keep the suggestions coming and maybe Apple with come up with a fix for this. Symptoms Your iPhone may have one of these symptoms: iPhone displays "No Service" or "Searching" in an area of good coverage iPhone doesn't regain service when returning to an area of coverage Resolution If you encounter either of the above symptoms on your iPhone, follow these steps to attempt 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 iPhone off and 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. If you're outside the United States, please also follow these steps: Go to Settings > Carrier > Automatic. If the phone registers any carrier network, Settings > y83cy2z Carrier will be present. If the Carrier option is missing in Settings and you're outside of the Unites States, please for support and service options. Set the option for Automatic to off. A list of potentially available carriers appears after about two minutes. If the device is locked to a carrier, it may connect only to the carrier network to which it is locked. If the device displays carrier networks, then the device is working as Dog Insulin ELISA Kit
http://www.cusabio.com/ELISA_Kit-84812/ expected. Set Settings > Carrier > Automatic back to on. If you're still experiencing No Service issues,to check for any network or account issues that could cause these symptoms.