do you dare to use your mobile phone to chat for a long time?  

I never use my cellphone for long interval of chatting because I fear my mobile battery's life will reduce and also I dont have mobile hone charger everytime to get it rechaged back every now and then.

Of course, cell phones always pose some danger on our health,especailly our brains because signals from phone interrupt our nervous system and signals transduction in our brains. I have inclination to use cell phone combined with a bluetooth headset for a long time. Some researches demostrate that bluetooth headsets can reduce celluar radiation by 90 percent. So I think bluetooth is of use and great. You can use it to chat for a long time.