[Resolved]  Datawind — ubislate C+ is not detecting any SIM card

My ubislate C+ is not detecting any SIM card, (idea, BSNL, vodaphone, Airtel) Signal Strength showing 0 DBM 99 ASU. I contacted in [protected], the gentleman told that this problem is not with the ubislate it’s a network problem with the concerned GSM provider. These SIMs are well working with other mobile phones & Tabs. What i will do ? also have POOR WI-FI connectivity. from where i get serviced this TAB? Need to send your Amritsar-143001 address? 1) As a ISO 9001:2008 And 14001:2004 Certified company 2) On 22nd July, 2010 Shri Kapil Sibal had unveiled the device 3) November 11th, 2012 by the President of India, Pranab Mukherjee, the second version of Aakash 3) On November 28th, 2012 by UN Secretary General Ban Ki Moon launched it at the United Nations in New York. But, why this “very strong globally” tablet have not a single service center any anywhere in India? JAYAPRAKASH VM IMEI-[protected]