When a mobile phone number expires, does the phone company recycle the number to be used again?
I recently found my old sim card with a bunch of old numbers and when I added one of the numbers on my new phone and logged into Wechat, someone elses photo (someone I don't recognize) popped up in the new friend Request section and asked me if I wanted to add him. Also the photo on whatsapp was a different person. Could it be the original number has expired and someone else has it now?