REQ: Samsung mobile phone

Do you ever check or explore the structure of samsung GSM phone ? We measured its sensitivity , it's very good when use inside antenna (slide phone)or outside antenna . i found it made some improvement on Grounding around FPC connecting, but its FPC only use single layer . Is there anyone can tell me how to imporve its sensitivity on slide phone using inside phone . I met such a problem but can't find a way . thks

Isn't there anyone know it?