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T9 text with a rotary phone. That would have been fun.

I thought it'd be T9 - that was a glorious system.

I still miss it to this day, for basic texting it was the superior system.

It's easy to install a custom keyboard on Android, at least.

no real tactile feedback

It was useless if your language isn't supported, though. For many, T9 was no longer relevant by the time their language got support.