I recently flew to South America and put my phone (Samsung SGS3) into airplane mode. Imagine my surprise when during my flight I received a text message from Verizon, saying "Welcome to Mexico." And then more info about signing up for a global plan. How did Verizon know I was crossing over Mexico and how did they send me a text message? Isn't airplane mode suppposed to turn off all radios? Wifi was not on either. I was on American, which does have wifi, but my wifi was turned off. Or does airplane mode not really turn everything off?
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