A great addition to this would be to provide the option of in-app VoIP calling with something like the Twilio client. This allows for support to know who is calling (and potentially why) as well as makes phone support FAR easier to get hold of in some foreign countries.
When I go to Japan, I exclusively have data access, no calls or texts on my SIM due to local anti-gang laws. Our UK SIMs get nothing and I’ve had difficulty using applications such as Three InTouch (yay registration issues) or Skype to call Lloyds Bank when a friend had their card locked (eventually found BT’s VoIP app worked with a borrowed BT login). What we did have was perfect 4G/LTE with WiFi in every hotel, airport, most stations and convenience store.