Answer:
Vodafone is a London based mobile communication company that provides mobile phone service, mobile internet, etc. They are one of the largest such companies in the world. They do not made specific Vodafone brand phones. If you get a plan through Vodafone you can still get an android or Blackberry or any other brand of phone. They offer both monthly plans and pay-as-you-go plans. Vodafone is not available in the US (though the company does own a large portion of Verizon Wireless) but go check out their website for phone and plan pricing and whether it's available in your country.