Is it scam ??

I had purchased a 2nd hand iphone from dollar and mene purchase krte time bill acche se nahi dekha tha mene jb ghar aakar bill dekha toh previous owner ne emi par liya tha and mene call karke pucha toh uska kehna tha ki 9 months ki emi left hai and voh paid kar raha so ky mere sath kuch problem aa sakti hai future me if he's not pay the remaining emi's