To block your SBI credit card by a phone call, you can follow the steps below: 

Step 1: Call the toll-free number 1860-180-1290 or SBI’s helpline number 39-020202. 

Step 2: Dial the required digit to select your preferred language. 

Step 3: Follow the instructions by IVR to register your blocking request. 

Step 4: Dial 2 to report instances of lost or stolen credit cards. 

After successfully registering this request, your credit card will be immediately blocked.