If I reset my phone (samsung s9) will it erase my number?

No.... It will be fine

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no, it won’t, just your personal files. the sim card has the phone number programmed into it.

Of course not. The # is programmed into the sim card.

omg no dont d that please

No, it wouldn't.

Nope your number will remain no matter how many times you reset your phone

Number is programmed into the sim card, you will not lose your number.

Of course not. And if you're properly signed into Google like you're supposed to you should have your contacts saved.