how to interpret the serial data

Proper use of capital letters and punctuation would really be appreciated here. You sound like a little boy whining.

You keep saying you want to store A character, and then you say that the character is 0999999999.

Well, I have news for you. 0999999999 is not a character. It is a string.

If you want to ask about how to read characters, and store them in an array AS A string, then say that. Don't keep referring to 0999999999 as a character.