The "find my phone" app shows all my apple portable gear (IP4 S, iPad2 and MBA). If this can not access GPS, it's my understanding that it then uses wi-fi triangulation. If the latter is correct, why can't it "see" my older 3G IP?
MB Pro 15-21.5 iMac, Mac OS X (10.7.2), -iPad2 32G IT 8G-IP 4 32G-Nano 16G