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I've sort of suspected this the case for a while. On VPN, MMS and Visual Voicemail still work on Android. Both of these require direct mobile access or they wil
by kop316 2y ago
I've sort of suspected this the case for a while. On VPN, MMS and Visual Voicemail still work on Android. Both of these require direct mobile access or they will get rejected (sometimes they are only on the mobile network, or else they requests get rejected if they don't come from within the mobile network). I suspect the same is true of VoLTE. If there is a VPN, that would mess things up.
I found this out since on Mobile Linux, if you enable VPN, the VPN breaks all of those.
I don't think there is a clear way to fix this on Android without breaking a lot of expected functionalty.
- nickburns 2y agoironically SMS/MMS and VVS are two of maybe a few other operations/functions (system updates maybe? maybe?) that are justifiably 'hard-coded' to the carrier connection. i've done the dance re: VVS with advanced AT&T support on VPN'ed iOS—so can confirm your point is not limited to Android.
- bestham 2y agoNo VoLTE uses a dedicated bearer (network interface) in the LTE stack. Not the one used for data. Different bearers can have different priorities/QCI (like QoS). In a congested LTE network VoLTE should provide a better experience than VOIP on a lower priority bearer.