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articles on adderall abuse in college Here's how it will work once the service starts next year: Customers use a universal SIM card provided by Cell Buddy. Travelers turn on their phones and launch a Cell Buddy app once they reach their destination. The app finds local carriers and lets travelers compare prices, data packages, download speeds and other factors. Travelers are assigned a local phone number and can continue to use their regular phone number back home, at regular prices, using the same SIM card.