Just something to keep in mind is that video calling is still a heavily proprietary endeavor. There are open standards that are not platform restricted (i.e. RTMP) so video calls are just a matter of user-to-user no matter what device or service they're using, but it's still matter where a lot of services, such as Apple's FaceTime, that require both parties (sender and receiver) to be using the same app. So when your wife is attempting to make a video call, there's a matter of what app the recipient uses on their end -- FaceTime to FaceTime (not an option for Android anyway), WhatsApp to WhatsApp, Duo to Duo, etc. will work out pretty seamlessly but once you mix in all the other alternatives that gets more complicated. Also note that FaceTime is an Apple only requirement while apps for Duo, Skype, WhatsApp, etc. are available for both Android and Apple devices.