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Jun 6, 2016 12:57 PM in response to shivanshu32by leroydouglas,Follow the 3R's- if a restart does not solve your problem proceed
User troubleshooting is:
1. restart, ie power off/on,
2. reset http://support.apple.com/kb/HT1430,
3. restore from backup, restore as new device. http://support.apple.com/kb/HT1414
You can try popping out the SIM card and putting it back in.
Remove or switch the SIM card in your iPhone or iPad - Apple Support