IPhone 4s looks shut down all the time.especially when the 3g is on.in the forums its said to push the use button and the power button at the same time.the people calling me cannot reach at my phone.what should i do ?

Question

my phone looks like offline all the time.its all about me to notice that its offline.then i have to push the main button and the power button together to open it.then the apple sign comes on the screen and the phone turns online.but i cannot receive the information of who called me at the time that my iphone 4s turned offline by itself.i cannot receive messages at all.what can i do now ? i sent the phone to the service and they just told me that they installed the current version.but i guess nothing happened.its doing the same thing again.i cannot use my iphone.
From Turkiye.

Answer 1

I've tried all those.But nothing works.The phone seems to be shut down.But it is not.When i get it out of my pocket, for example to call someone, i touch to main button but nothing happens.I solve it by pushing the power button and the main button together just for a couple of seconds, as its said so in the forums.
also, people told me that they were calling me, my phone was ringing but i didnt answer?...i checked it for millions of times, it seems to be shut down, but its normally not.then i push the buttons together and the apple sign comes on the screen.it searches for the network.and it works.
but i do not see any calls, texts anything.but for the others, they say my phone seems to be workin.
I thought it was 'cause of the 3G is switched on but when I turn 3G off, it does the same thing.it seems to be offline all the time.