[1] KYC is one time exercise while dealing in securities markets - once KYC is done through a SEBI registered intermediary (broker, DP, Mutual Fund etc.), you need not undergo the same process againwhen you approach another intermediary. [2] Prevent Unauthorised Transactions in your Trading/Demat account Update your Mobile Number/email IDs with your Stock Broker/Depository Participant. Receive information/alerts of all debit and other important transactions in your Trading/Demat account directly from Exchange/NSDL on your registered mobile/email on the same day. [3] No need to issue cheques by investors while subscribing to IPO. Justwrite the bank account number and sign in the application form to authorise your bank to make payment in case of allotment. No worries for refund as the money remains in investor's account.