help bois.

got old school backup phone Xperia SO-04E (Xperia A) DoCoMo set want to set up using local Digi Telco.
used to be able to use Digi sim but after stupid kid factory reset otomatik kenot detect call line - only 4G LTE internet.

can help fellow oldfag enable call and use UMB code again with this phone?
already tried various APN setting but all bullcrap no work.

halp pls.

just a wild guess but is data roaming turned on
I dunno much about japanese variants of Sony Phones
but I have a friend who has one and he has data roaming on forever to be able to use internet

I can use internet lol (the sim and carrier are detected) but cannot use to call or even access the UMB option (like the Digi *128# thing).
so here I need help on being able to check credit balances and even basic call function.