PTA will block all used mobiles after 31 December 2018. Pakistani Government PM Imran Khan announced that they will block all stolen, smuggled and PTA non-compliant mobiles from 2019 start.
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How to verify mobile IMEI registration?
You must have to verify your mobile on PTA so that your mobile should not be blocked. You must have your used mobile PTA compliant otherwise your used mobile will be blocked by PTA. I already made a video on how to register mobile on PTA.
Also, you must be careful while you buy used mobiles.
10 tips to buy used mobile