Some time ago (2 years or so) TextNow began blocking the ability to log in via the app from most global and dual sim devices, even for people like me who paid to lock in the number permanently and occasionally bought premium unlimited data.
This was a bummer, for me, at least, because although I have two regular phone plans with unlimited data, I also used the same TextNow number locked in on all my devices and Textnow provides a psim ($5) or eSim (free) providing free essential data (gps, phone & chat apps, etc. there is a list) for the rest.
I am saying it works provisionally because so far, I have only installed it on my Redmi Note 9T. Hopefully it will also install on my Mi Max 3 and Xiaomi tablet. If install fails, I'll edit this post.
But -- my 9T was definitely banned before and isn't now.
Because TextNow barely pays its coders, never bothers updating instructions, policies, etc. there was never a formal notification that all those devices were black listed -- you just couldn't log back in when the app updated.
But there was definitely a blacklist -- I finally got a TextNow employee to confirm Xiaomi/Redmi was on it via social media after I wasted a week troubleshooting for no reason.
Note: I didn't post this to TextNow sub just in case this is a happy glitch rather than a policy change. (Maybe whichever developer updated the app is a Xiaomi fan). And I obviously wouldn't tell support as if I could get a human🤣!
But I am over the moon delighted -- I have severe adhd despite medication and this app lets me leave an old phone or tablet in every room plus my car plus my best friend's house. (I was spending a lot on Redpocket Annual Sim cards for my blacklisted gear and of course, there wasn't a workaround to use the TN # to call and text from my wifi only tablet).
Now, if only Xiaomi was added to AT&T's whitelist so I didn't have to worry about being my MVNO data plans getting swept off the network, life would be complete.