Hello OSians, well, we buy many things from online, but mobile is our favourite and always comes first on mind regarding online purchase because of its low prices. Well, I’m helping my friends buying mobiles at low prices available in the online market. You know we get a printed mail with " stamp " sometimes and also with " no signature required " ones sometimes. But have you crosschecked the Vendor’s TIN no. at this website, http://www.tinxsys.com/TinxsysInternetWeb/searchByTin_Inter.jsp I use to check every time I buy a mobile or any warranty based Gadgets from online. I’m now giving few examples for that, what we can do if a TIN no. is not traceable You know as per my knowledge, most of the Mobile related wakeupcalls comes from these sellers, Mntstore, first_shoppers, clickbuy.in, surf-2buy etc.. I have purchased from all of them, Mntstore whose tin no. I’ve got with me and cross checked in the above TIN search website. It gave the details as below, So verified that the seller is genuine and sent the real VAT paid bill… . Here are some more verified pics from the Vendors, " first_shoppers", “Yebhi” . Its was okay, but when I tried to check those of the ebay seller " clickbuy.in " and " buytheprice " This message I got, . So I always preferred a bill with Stamp on it, to be on the safer side. But that of BTP, I dint get any reply for that issue, but still its a company with the logo on the bill, I thought it might not create any issues at the service centre. Anyone having those bills with you can cross-check once, and anyone willing to correct me if I’m unaware of any details or anything welcomed . have a safe shopping!! . Hope this thread will help!!