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I didn’t know you can use letters as phone number and call it.

It corresponds to 1-800-784-8669

Nice, never heard of someone using letters on phone numbers. I did used to send text messages like this.
Oh! I assumed you were too young to have known about texting like that. I forgot that marketing style isn’t very common outside the states
This is the most Zoomer comment I’ve ever seen
The practice of using the T9-letters to memorise a phone number is just not done much outside the USA
Yep in know about it from American media but never seen this done anywhere else that I know of (and I know how to type T9).

Even referring to them as “T9-letters” is a massive neologism. Those letters have been on telephones going all the way back to the very first rotary phones when you were first allowed to dial a number yourself without talking to an operator. Before, you’d tell the operator you wanted “Wabash 3 - 1234” and they’d connect you to number 1234 on the Wabash 3 exchange. To dial that same number when the dial telephone came around, you would dial WA3-1234, or 923-1234.

Here’s a great film from 1940 introducing people to the idea of dialing on a telephone and explaining how to use the letters: Internet Archive Link

Dial Comes To Town : Free Download, Borrow, and Streaming : Internet Archive

Internet Archive
As certainly not a zoomer I can safely say I’m glad they are gone, nothing is more annoying than those letters.
This makes me feel old.
What did you think the letters on the number buttons were for? Nostalgia?
For text messages.
I suppose if you’re young enough you wouldn’t have known landline phones had the letters, too. 🤔
I know, still have 2 but rarely use them.