I had no problem receiving promotional or banks SMS from the 5 digits number.
Digi introduced VoWiFi in 2017 but disabled the use of VoWiFi during the early days. In early 2018, someone reported from Amsterdam that Digi VoWiFi worked there and he had used it to receive calls but was not charged a single cent. I tried it out myself in Kyoto and Osaka, Japan a few weeks after reading the post and it really worked. Since then I had used VoWiFi in Seoul, Hong Kong, Taipei, Taichung, Kaohsiung, Bangkok and multiple countries in Europe.

Any specific phone to activate vowifi? Or, any phone will work?

Hi,

Once the Wifi Calling is enabled, does it mean that all Incoming and Outgoing calls will be using Wifi; even if the phone detected network coverage?

Thanks

Yes , just ensure the WiFi Calling function is enabled , device is compatible with telco WiFi Calling services
then enable flight mode and connect to WiFi , then your devices now is 100% relies on WiFi Calling

Thanks for the info.

Can we have both the network (without enabling airplane mode) and Wifi-Calling enabled at the same time?

Is there a prioritization whereby it will first attempt the call (incoming/outgoing) using the mobile coverage? If failed then only use Wifi-Calling?

Assuming if I have both enabled, and so happened I have walked into a location where the network coverage is weak. Will it switch to Wi-Fi-calling automatically? OR it won't, since it can still detect the network coverage?