You are pretty limited to finding a 2014 era smartphone. While it is possible to install a ST10 type receiver, I seem to recall there were some nuisance issues about warnings that would come up on screen. And it would likely become more expensive that replacing the smartphone.i have 350qx2 with spektrum dx7
@DoomMeister sent me this a while back. This will tell how to view it on your PC. I do not know if there is an equivalvent way to stream it to your phone.yes this is ip .
how to see this like streaming
this try to found but nothing yet