Your concern is valid. Is this friend/acquaintance someone you trust? Is he looking out for your well being/safety? Your call, but before using the phone, get much more info....bout the gifter and the gift.
Prudence is not paranoia...
Heck no, I don’t trust him. Known him distantly several years, still know almost nothing about him. The generosity he shows is a recent thing and baffling to me.