Is it possible to install car mode from a T-Mobile Note 4 and install it to an ATT Note 4? I have been looking for alternatives so that texts are read out to me and so far I have not found an adequate one.
You can back up any app to an apk file. Whether it will work on another phone is another question - you'd have to try it. You can use App Backup & Restore to create the apk file.