Used Phone & No Apple iCloud Password I was given an iPhone but I don't have the Apple iCloud password. 

I don't use as the iPhone as a phone, so no carrier is enabled. I just use it with my home wifi. 

A message to enter the old users iCloud password pops up at times. 

Any suggestions to make the pop ups for past owners password to stop?
You have to remove the iCloud lock to become the rightful owner of the phone. The previous owner should be able to remove the lock using his/her password. Otherwise it is essentially a stolen phone.