You might have just broken your smartphone and, rather than getting it repaired, decided to purchase a used model.
Before you do, make sure you get the phone’s IMEI number, which can be found in the unit’s settings. If a seller is unwilling or unable to provide you with the number, do not purchase the phone.
Once you obtain the number, check it on a site such as swappa.com.
Such results will determine whether your phone was lost, stolen or was tied to an account with an unpaid bill. Such phones can be locked from use by their cell providers and rendered useless until a resolution is made.
Do not be victimized by this oversight.
Any questions? Contact me at Midcoast iPhone Repair and I will help you as best as I can.