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I’m not sure how much legacy code is written for contact apps in smartphones. But given the amount of tweaks and changes apple and Google make in each of their releases I would expect they wouldn’t have any problem integrating this feature.
Also you mentioned legacy code, but why T9 dialing isn’t a thing anymore coz that would be available if they were simply extending from legacy codebase.
I was just making a joke. Hopefully, those apps are not like the hardcoded messes that I’ve had to deal with before.