I got her number from mutual friend. Should I call or text her, and what should I say?

Anonymous
There's this girl I have huge crush on, she knows about me because we talked once and we see each other almost everyday.
We have mutual friend who knows that I have crush on her. He told her about me and that I find her attractive, he told her that he will give me her number and she said okay. She even told him she will wait for me to contact her.
Now that I have her number should I call or text her first and what should I say. You should know that I'm extremely introverted person, I barely talk to even my family.
I got her number from mutual friend. Should I call or text her, and what should I say?
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