There may be few possibilities like the network not recognized,
locked with some other network,firmware not updated etc...
Network Not Recognized:
First, go to Settings-->Then go to Wireless and networks.-->Then Tap Mobile Networks (If mobile networks not found then tap More settings and then find and tap Mobile networks).-->Now tap Networks operators.-->After complete searching.... Then select your Network Operator (Like Vodafone, Idea, AirTel, etc.)
That's it, problem solved.
Locked with someother Network:
I suggest you can approach
Prounlocking.com and specify the country,locked network of ZTE .Based on the availability you can get the permanent unlock code along with free instructions.
UN-updated firmware or software:
Select Software Update and Wait For It to reboot and Completed Update Completed!
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