Step 1: Understand the service described:
The question describes a banking service used on a mobile phone or tablet.
The customer does not visit the branch or use a computer. All transactions happen remotely through a device.
Step 2: Recall the term:
Banks give customers an app or a text-based service for phones and tablets.
Through it, a customer checks balance, transfers money, pays bills and recharges mobile numbers.
This service is called mobile banking.
Step 3: Separate it from similar terms:
Internet banking needs a web browser, usually on a computer, to log in to the bank's website.
ATM banking needs a card and a machine. Tele-banking works over a phone call.
Only mobile banking is built for phones and tablets.
Final Answer:
The blank is filled by mobile banking.