That is a real advantage, you can use T9 entirely by feel with some experience and you can't with a soft keyboard.
That said I'm currently on an Alcatel Sparq II (a dog chewed up my smartphone) and T9 is dramatically slower for me than even a shitty OSK was, much less a modern one with haptic feedback and gesture typing. Luckily this phone also has a slide-out keyboard so I don't have to rely on it
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That is a real advantage, you can use T9 entirely by feel with some experience and you can't with a soft keyboard. That said I'm currently on an Alcatel Sparq II (a dog chewed up my smartphone) and T9 is dramatically slower for me than even a shitty OSK was, much less a modern one with haptic feedback and gesture typing. Luckily this phone also has a slide-out keyboard so I don't have to rely on it
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You can get T9 keyboard apps on Android (with the T9 dictionary as well), but the main thing is losing that physical sense of touch.
Swipe typing is the fastest way on mobile, and really smooth if your phone has a high refresh rate screen.
also dumbphones are much easier and safer to use one-handed