usually this can happen especially if you have lots of apps... best to do factory reset. otherwise, can also try to slowly clear the cache/ data of the apps individually...

this is actually one pain with android that i hope can somehow get sorted out. i'm curious if this happens for iPhones? i mean... after firmware update... in my experience with android... always better to do factory reset/ wipe. else, you get overheating, battery drain, etc... dem painful. :S

this is the painful part. what is left is what you get when you first got the phone. anything else that you installed will no longer be there.

however, there is an option when you do a reset to restore everything to the phone (i think when you enter your gmail account during the setup). you can opt the have everything installed back for you.but if you have games, etc... unless there is a export game data option, otherwise, you lose your game progress.

same with sms... you lose it unless you have done a backup first. speaking of sms... i've never gotten the samsung service to successfully backup my sms. stupid service. usually i just use the apps called sms backup and restore.

romy: if done right google play store will auto install but you would lose some or all app data. unless u have a backup