questions for "primary=true" and mmsc

I am trying to use this service provider on mobile phones

But I got two questions when I see the serviceprovider.xml


In the provider tag, there's an attribute 'primary=true',
I got an example here [1], In that case, one of T-Mobile's mcc-mnc has the same code with a provider called "Ben".(both mcc is 204, mnc is 16).

So the attribute 'primary=true' is added to indicate that we should always select T-mobile when mcc & mnc got collisions.
My question is, in this case, under what circumstance will the MVNO 'Ben' should really be selected, instead of the primary one(T-mobile)?

I found some apn whose type is mms, but where can I find mmsc??



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