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[ DOWNLOAD ]Joyn Apk For MetroPCS

Joyn was only compatible with the old CDMA Metro system and phones, it is no longer supported since the T-Mobile takeover and GSM conversion. Not sure why it still shows up in the Play store, must have slipped through the cracks.
Joyn is a Rich Communication Services (RCS) communication client. Rich Communication Services does not should require CDMA. Rich Communication Services should be usable on any network that supports it. The Rich Communications Services technology was started by GSM Association.

At this time there appears to be no native Android app that supports Rich Communication Services. A client must be installed or be provided as a stock ROM bundled app(s).

T-Mobile USA supports Rich Communication Services and branded it as "Advanced Messaging". See the T-Mobile Newsroom article, https://newsroom.t-mobile.com/news-and-blogs/advanced-messaging-blog.htm .
 
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