I have the iPad Mini 5 and just to be clear, it can be made to fit, but to do so requires pressing the two controller mounting arms outward to the point where they almost begin to bend. It is NOT a comfortable fit, and I would be concerned about both the pressure on the iPad bezel as well as possible long-term consequences to the controller arms.
However, since it can be made to fit, after a fashion, and since an iPad Mini is larger than any phone, I'm pretty sure that any phone will fit.