i usually charge my phone when its on, and when the battery is full it doesn't charge anymore even if i used 3G over 2hrs,played nova,watched a movie the battery will be still full even if i restart the phone without the charger,

i have also noticed that when the phone is charging while am using it the charger is extremely hot than when am not playing with the phone while on charge and i also remember having a fried charger when i was surfing the internet and charging the same phone that i had to buy this one am having 1amp. QUESTION: where is the technic? is it safe or my battery is dieing softly?

I'm not sure that I understand exactly what is a question here or what it's really about but the bottom line is, if your charger can provide more power (in mA) then your phone (or any other device) can consume than it will always be fully charged.