Was your phone like that when you bought it? Is it a brand new phone? I think if it's like that most of the time, you better bring it back to the shop so you can still use the warranty if there's anything that would need to be fixed.

I don't know why the phone automatically hangs up.when I send information, if the signal is bad, it always retransmission many messages,Please masters give me some good directions,Thaks