My ZTE Z981 Zmax Pro will not get a data connection, Googles message says Internet connection is not reliable at the moment

To unlock zte zmax pro you need to collect the following details:
First of all you need to confirm that your phone is locked or unlocked?
How to know your phone is locked?
Insert a non supported sim into in if its asking for unlock code the its locked
What you need to unlock your ZTE Zmax
1) Brand Name i.e. ZTE
2) Model:- Model no of the phone
3) Network: Need the network your phone locked with
4) Need the country of the network
5) Most Important is IMEI no of the phone
Once you collect the above information you need to search a unlock code service provider (unlockninja)
Visit the home page www.unlockninja.com. Select brand model then on the next page select country network and mail id
Check the price and availability and proceed to payment.
At the same you will receive on your email the login details for unlockninja portal. Log in and update the IMEI. At the same time you will get the minimum time frame to deliver the unlock code that is 30 min up to couple of days. You can unlock any cell phone by this way weather its locked on any network