The answer depends on who the test is being written by and what is says. If the text message is written by one of the parties to the case, then the text is admissible as an admission by a party opponent. If the text was written by a nonparty, the text will be considered hearsay, unless it falls into one of the legally recognized hearsay exceptions. I would need to know that context of the text and the party sending the text to better assist you in this question. You may have to have a person from the phone company come in to court to authenticate the text message - i.e. confirm that it came from the parties phone to the other person's phone and is authentic.
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