Less hassle on the login screen.
On many sites, the login page is the most annoying part; at 39BD it's kept concise, so on mobile you don't have to scroll for number, password, then login is easy.
Users in Dhaka and Chattogram usually can log in quickly after switching mobile networks; on slow networks there may be a slight delay, but with 99.2% uptime most of the time the page loads smoothly.
