Could we still use this free service on T-Mobile network?
I think it likely depends on whether TextNow qualified for the no-change-in-cost guarantee T-Mobile offered MVNOs, and whether they followed up and made such a deal.
Since TextNow has been spending money on TV ads to promote their service, it seems like TextNow does see a way to keep the model viable past the shutdown of Sprint CDMA-- so I'm guessing the short version is 'likely yes'.
Hi KentE, happy new year to you!