Changing modem might improve your phone and WIFI signal at the same time phone battery life.
1. http://dl.dropbox.com/u/2188872/Modem_XXJVE_CWM3.zip
2. http://dl.dropbox.com/u/2188872/Modem_XXJVK-CWM.zip
3. http://dl.dropbox.com/u/2188872/Modem_XXJVK-CWM3.zip
4. http://dl.dropbox.com/u/2188872/Modem_XXJVO-CWM3.zip
5. http://dl.dropbox.com/u/2188872/Modem_XXJVP-CWM3.zip
All the links above are from my dropbox account (2GB FREE)
Im from Malaysia, Maxis. Using JVO currently is the best for my phone and WIFI signal with minimum battery drop.