I lost my phone (iPhone 4S) while traveling four months ago in Poland. Today someone with a 650 number contacted me via text and asked for my address so that he/she wanted to send me the phone. The phone still doesn't show up on my FindMyiPhone account and I think I locked it. I'm not sure how they got my phone number unless they had unlocked the phone. Is there anything I should be aware of before I send them my address?