UbiSlate 7 (Ubislate 7+ now) is the upgraded version of the world’s cheapest tablet – Aakash.Datawind, the Canadian company manufacturing Aakash Tablet has now started pre-booking of UbiSlate 7. They are already taking orders for the Aakash tablet and have started the shipment process. UbiSlate 7 can be pre-booked online for Rs. 2999 ($60).Features of UbiSlate 7+ :As can be seen, the biggest improvement is the availability of a SIM slot so it can be used as a phone too. It also has a better processor and battery backup to make it more efficient.UbiSlate 7 can be pre-booked from the official website of Aakash tablet @ http://aakashtablet.com. After pre-booking, user will get a confirmation message statingThe commercial version of the Aakash, UbiSlate 7, would be launched in early weeks of December. After the commercial launch we would get in touch with you to deliver your device as soon as possible.The confirmation message actually needs to be corrected as, according to their website, UbiSlate 7 will be launched by the end of January, not in December.Update: Ubislate 7 has now been renamed to Ubislate 7+, rest is same.