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Hello @JimC52, thank you for reaching out on the forum with your concern, we appreciate it. There are 2 main points regarding voicemail for newer android devices with Xfinity Mobile (such as Galaxy A50, Samsung S10, Note 10, etc).
1. New android devices will use the default voicemail app that comes on the phone now and going forward. The Xfinity visual voicemail app is not compatible with the A50. That is why the app will not work on your device. The LG device that you mentioned might be an older model that is still compatible.
2. The native voicemail app for android devices does require mobile data to be on in order to retrieve voicemails. It will not receive any voicemails through the app with just wi-fi being on and data turned off. The Xfinity visual voicemail app did have the capability of getting voicemails without data turned on. Unfortunately data will be required on the native voicemail app.
You can always dial *86 to listen to any voicemails as well, and it will work with wi-fi only.
I hope this clears up your concerns, and please feel free to reach out directly with any questions.
Thank you @ComcastTito. Your answer is thorough, though the result is disappointing. Now I am wondering what would happen if I swap the phone numbers -- i.e., the SIM cards -- between my two smart phones as it is more important that my newest phone number notifies me immediately every time I get voicemail. How complicated would mthat make life during the transition?! Thanks, again.