how long do you have to talk on the phone to get danger radiation?

Probably forever.

The energy deposited in your head by a cellphone transmitter is essentially thermal, and is insufficient to raise the temperature of your brain by any significant amount.
 
The land phones do not have any dangerous radiation,Only the mobile phones which work with micro wave radiation.Several studies made didi not make any dangerous radiation for human life.
 
There aren't that many conclusive studies, as is the case with all cancer studies, it's a probability risk that has other factors... it's like asking how many cigarettes can I smoke before the DNA in my lungs mutates so that the cell division mechanism doesn't know when to shut off and I end up with tumors.
 
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