If you are a user of SBI internet banking facility, here is a message. SBI account holders have to register their mobile numbers with the bank by 1 December 2018, failing which the bank will block access to their net banking accounts. Attention INB (internet banking) users, please register your mobile number with us immediately, if not already done, through Branch, failing which the Internet Banking facility may be blocked with effect from 01.12.2018, SBI said on its website.