I was in a shop where this random lady came up to the shop asking the shopkeeper to buy some red lable or something, than she asked me for a help with giving her my mobile phone to call someone, I first hesitated but I thought I can be a little cautious and let her dial the number with phone in my hand, she dialled the number - 1800 121 170 170 . The call rang once than got cut and after a sec I got a message with some kind of code/OTP, i instantly hide the phone and asked her, why she dialled some random number because you asked to call someone, she said you wanted to get some red lable, she was with a pen and wanted to write that code in her hand where there were many more codes allready written, I asked her to leave and I instantly got away from there and than check *#21# for checking call forwarding, it was not forwarding, I searched for this number and got several similar complaints by this number.