Why is the Oneplus 8 supported on RW, but not the 8T. As far as I can tell they have identical communications specs (ie. supported GSM bands).
Hi @erikp.fp41qb and welcome to the Community!
As it exists today, there is more to compatibility with Republic service than a phone’s hardware specs particularly support for radio frequencies (bands) used by one or both of Republic’s cellular network partners. Republic uses proprietary technology blending the Voice over Internet Protocol (VoIP) network of its former corporate parent Bandwidth.com with one of two cellular networks (T-Mobile or legacy Sprint). VoIP is the technology powering the WiFi portion of Republic’s blended WiFi/cell service.
This blending of networks (one VoIP, one cellular) is managed by Republic’s required mobile app. To insure blended service managed by its mobile app works as expected, Republic requires use of certain U.S. factory unlocked phones and tests its app on specific models before potentially adding them to its roster of compatible phones. It may be that the OnePlus 8T failed testing or simply has not been tested.
Beyond that, Republic is making changes to its methodology for adding new compatible phones as mentioned here: Pixel 5a 5G: How long does it take for Republic to verify "bring your own phone" compatibility? - #21 by southpaw.
Some have speculated forthcoming changes in how new phones are certified for compatibility is related to Republic’s acquisition by its new parent company DISH: A Letter from Our CEO: Republic Wireless Joins DISH!. Time will tell.
excellent answer and helpful info. thanks @rolandh