ANSWERS: 3
  • Your phone number is stored in the SIM card, so one may insert your card into own phone and use it. Also, there's a lot of "caller ID spoofing/faking" services (http://www.google.com/search?q=fake%20caller%20id) so one can send messages via web page.
  • on some phones varying by manufacturer have a feature where you can set the number to include in a text message when it is sent
  • They could go on the internet and send text messages through via the carrier's website, there is an option to "send text message" on most homepages.

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