iPhone?and Unbounded was literally not a Ridge Racer game... it was a wannabe burnout with the name slapped onto it.
Ridge Racer Slipstream might be a mobile game, but it plays like Ridge Racer 7, has tracks from the PSP games, RR6 and RR7... has some of the classic songs in there, has all the classic cars and it looks pretty nice for such an old Mobile game.
it's better than whatever that PSVita game was supposed to be, and has a fairer monetization model as well
and you can still easily play it btw. you can get the .apk file for android on some sites, and it still works offline... just multiplayer is non functional sadly, even local LAN doesn't work anymore... which is why I would love for someone to mod that thing... hell you could literally port it to the Switch even! the Switch can run android games with that wrapper this guy made for GTA.
but even as it is, it's a great game for on the go... just pop out your phone and play a quick race. I still play it from time to time, still have it installed on my phone, and I have the .apk file so I can reinstall it on every android phone in the future as well.