asked and no way to get that. but, tm will send sms to inform u the day it come for 30th days, 60th days and 70th days to that unifi mobile no.
it is inconvenient if u put the unifi mobile in a device which cannot receive sms and no email sent also.

Your Airtel don't support band 38, 40. Only support band 5, which is useless performance.

can lock to 4G but cannot lock band am i correct?

this is consider as lock to network, but may i know which code is band 5?
yes

if u are on bebas weekly unlimited plan, it will make no different as it is capped to 10Mbps across bebas weekly

actually can lock band. but you need to setting it using web. cannot from apps

enter gateway using web browser.
default ip add 192.168.1.1
default username n password admin/admin
go to settings, netword settings, and you will get to choose which band you would like to force.

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it doesn’t showed lte band 5, but it still supported. i only used to forced to band 38 and 40. if the area have no signal (no band 38/40), i will pick all band. the modem will detect band 5 that time.