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I bought my phone used and I cannot unlock my screen.

Already answered your question How do I factory reset my ZTE Grand Memo V9815

Hi, I just saw your question regarding “How to unlock Phone””. Well, nowadays, there are many third party company provide phone unlocking services online. I researched on Google & found many third party sites like: unlockninja.com They provide phone unlocking services for any carrier or network Safely, Legally, Quickly, Forever! If your problem is not resolved yet, i’d recommend you to browse unlockninja.com & follow the steps to resolve your problem. I hope you will get solution from this web portal. They also provide unlocking services through android app. You can download it from here https://play.google.com/store/apps/detai… Thanks, Update (12/07/2017) How to unlock a cell Phone Here is step by step guide to unlock a cell phone Note:- To unlock a cell phone make sure its asking for sim unlock code or network unlock code while you insert a non-accepted sim in it Step 1:-Select the online unlock code service provider -Go to the best unlock service provider who deliver the code on time with in given time like https://www.unlockninja.com/ i used to unlock my ZTE phone Step 2:- Give the cell phone details you want to unlock -Select your brand name or phone manufacturer. -Select your mobile model number. click the unlock now button to navigate the next page -Select the country from which the phone has been purchased. -Select the network on which the phone is locked -Enter the Mail id to track your order status click the unlock now button to navigate the next page ‘Step 3:- Update IMEI No’ -Place order by making a payment by using your credit card or paypal account Get the login details to update IMEI on the portal Update IMEI and wait for the given estimated time to deliver the code You can use any sim card after the device has been unlocked