Have some fun with the numbers. You can assume that some of the recipients will still have your number in their phone so when you call them they will think it is the previous owner.
- Pretend you're an emergency worker and there has been a serious accident
- Pretend you're previous owner's boss/teacher and enquire as to why you saw them working at a brothel
- Pretend you're the police and the phone is evidence in a murder investigation.
- for best results it's best to do some background checks on the previous owner. Send SMS messages in different tones to different numbers to ascertain what gender and age group the previous owner fits.
- don't actually do this (but if you do, post your results)