Aqui teneis las Headers que envia nuestro movil:
GET / HTTP/1.1" 200 45 "-" "Mozilla/5.0 (Linux; U; Android 1.5; es-es; HTC Magic Build/CRC1) AppleWebKit/528.5+ (KHTML, like Gecko) Version/3.1.2 Mobile Safari/525.20.1
GET /favicon.ico HTTP/1.1" 404 329 "http://***.**.***.**/" "Mozilla/5.0 (Linux; U; Android 1.5; es-es; HTC Magic Build/CRC1) AppleWebKit/528.5+ (KHTML, like Gecko) Version/3.1.2 Mobile Safari/525.20.1