Trick to online with 2 different contact list

example : nick xxx-1 and nick yyy-2. you want to online use nick xxx-1 but your contact list in nick yyy-2. this is the trick :
1. login with nick yyy-2
2. when appear 'downloading contact list', press the back/cancel button
3. then change your username and password. login again. after login success, u will get ur nick xxx-1 and nick yyy-2 contact list in 1 nick (xxx-1)

NB:
the active contact list is only one contact list that is last nick contact list that u use to login (xxx-1) but the contact list from the first nick (yyy-2) is not the active contact list. the point is if there is a nick offline then online, we cant see it and the other way. if that nick online then offline, we dont know too because that list is not update. when we private chat, suddenly appear 'user is not online'