I'm guessing he's talking about SS7 attacks. Sure, you do everything on your side to prevent sim swaps or the numbers from being ported out, but all of those measures are moot if they're bypassed at the carrier level.
Not really SS7 attacks, it seems that this service is just built on top of regular MVNO/reseller APIs offered by the big carriers that we already know to have serious trouble with not getting hacked.
They might be able to protect you against regular port-outs, but not SIM swap attacks performed by people who’ve compromised carrier infrastructure.
They might be able to protect you against regular port-outs, but not SIM swap attacks performed by people who’ve compromised carrier infrastructure.