Running the Android Honeycomb operating system, the Tahiti is fitted with a seven-inch touchscreen and a dual core 1.2GHz Qualcomm processor.
Available in slate black or silver finishes, the tablet weighs 390g and comes with a 5MP camera, 6GB of RAM, AGPS, WiFi, Bluetooth, and a 3G+ connection.
Orange claims that the Tahiti will support up to six hours of working battery life.
Available this week from Orange retail outlets, the tablet will cost £69.99 on a £25 a month, two-year data plan - although that adds up to a total outlay of £669.99, around as much as a WiFi and 3G iPad.
Orange's tariff for the Tahiti offers 1GB of anytime data, but that is "quiet time data" only covering from midnight to 4pm, along with unlimited WiFi hotspot access each month.
Alternatively, the Tahiti is being offered for free on a Connected 24 month plan with the Orange San Francisco II mobile phone, available from £41 per month.
"We're pleased to be expanding our portfolio of own-brand devices into tablets for the first time," said Paul Jevons, the director of products and devices at Everything Everywhere, Orange's joint venture with fellow mobile operator T-Mobile.
"The Tahiti is a stylish, lightweight device with a great quality screen, which we believe really does offer great value innovation and will help customers to get the most out of their multimedia content whilst on the go."
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