is it bad to talk on cell phones when its raining outside?
Nope, no danger from talking on the phone when it's raining outside (assuming you are keeping the phone dry, to prevent possible electrocution), but care should be taken while talking during a Thunderstorm.
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Depending on the rain -- if it's raining hard or slightly dripping -- it may be bad to talk on your phone and it may either stop working or start acting "glitchy".
Yes. There is some concern about the safety of both wired and wireless phones during lightening storms, however. Just raining is perfectly safe to talk on the phone.