Steps:

1. Dial *#06# to get the phone's IMEI number
2. Note the IMEI number
3. SMS the IMEI number to 8484 or visit https://dirbs.pta.gov.pk/ to verify the IMEI number

PTA will send you a reply in 2 minutes to confirm 2 things:

1. Whether the phone is PTA registered or not
2. Whether there is a complaint registered with PTA against the phone

You can also use our OLX Mobile Purchase Form to record the details of the seller with you.