When the signal is weak, the phone is working more, you drain the battery faster, so only use a phone when the signal is weak in a true emergency.
Devra DavisRadar, of course, is what cellphone radiation is exactly like. It can be a similar frequency, it's just much weaker power.
Devra DavisIf you are a physician and someone comes to see you with an absolutely incapacitating headache or a swollen arm, you don't tell them, "Come back in 10 years when I've completed my study and I'll see what I can do for you."
Devra Davis