Originally Posted by
paperwastage
i got my umidigi s3 pro
wifi calling AND voLTE works for t-mobile US, surprisingly....
camera isn't great (as expected), but I'm content for $204
dont have another T-mobile/other SIM to verify DSDV VoLTE though
Trying Singapore Singtel Postpaid sim
Initially, VoLTE and VoWiFi did not work (HD icon in status bar, VoLTE flags were enable in the settings-network, but phone drops to 3G without HD icon during calls). VoLTE/VoWiFi worked after adding "ims" to the APN type under APN settings
EAP-SIM did not work though (to connect to singtel wifi). Usually singtel branded phones auto setup the wifi connection after inserting sim- this phone did not
I can still manually select the singtel wifi, connecting as EAP, choose SIM (or AKA or AKA') along with Sim1 or Sim2, but it still fails to connect
Compared APN settings to the regular singtel phone, played with/matched the settings, but couldn't get EAP-SIM to ever work properly. couldn't find more info on EAP-SIM