You are one of those trying to stir something out of nothing. But, being a kind Samaritan and Singtel MVNO user, I will help you out here... here goes...
Singtel & its associated MVNO suffered from slightly higher latency than M1, a few of a mini-seconds but seems like years to some.
Their price plans cost more just for the sake of better connectivity and speed.. Who cares about not being able to check into Safe Entry, wait awhile sure can log in la.. don't be so picky or in such a rush can already.....
And wait, of course VoLTE... the MVNO got no Volte... Although if the party you are calling does not have Volte then whether you have or not doesn't matter, BUT knowing you have VoLTE is already feeling damn shiok liao....
See me help bash Singtel, you song already right?