Ok.. put it this way. You want to watch a certain video on youtube, and the video size is 100mb, whether you watch it on 3G or LTE, you still would need to download 100MB. The only difference is when on LTE, the download rate is much faster. So Im sure, you pretty much understand that its better you just leave it on LTE.

but the scenario was. you wanna see the first part see if it's interesting b4 watching the whole thing

I'm pretty sure the only difference is the speed, but then again that may encourage you to watch more videos and browse more websites, hence your data will eventually run out, ha ha.

hey guys i received the update from maxis. Just press in settings --> general --> about phone, then u will get a prompt to update

do you know what is the difference after update the carrier settings from maxis